Middle School Science Quiz: Living Things Have Cells
20 questions · exam conditions
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Living Things Have CellsQuestion 1 of 20

Cells are the basis for determining whether something is living. A diagram shows two samples under the same magnification.

Sample 1 (Strawberry slice): repeating compartments separated by thin boundaries; many compartments contain darker dots. Sample 2 (Red candle wax): smooth red area with a few cracks; no repeating compartments.

Which prediction about a living sample is supported by the model evidence?

If you zoom in on Sample 1, the boundaries will disappear because living things cannot have boundaries inside them
If you zoom in on Sample 1 even more, you would still expect to find more repeating bounded units in the tissue
If you zoom in on Sample 2, you will definitely find cells because anything red is made of cells
If you zoom in on Sample 2, the cracks will start moving, which proves it is living
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Middle School Science Quiz

Middle School Science Quiz: Living Things Have Cells

Practice Living Things Have Cells in Middle School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Living Things Have Cells, giving you a quick way to practice the rules, question types, and explanations that matter most for Middle School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Cells are the basis for determining whether something is living. A diagram shows two samples under the same magnification.

Sample 1 (Strawberry slice): repeating compartments separated by thin boundaries; many compartments contain darker dots. Sample 2 (Red candle wax): smooth red area with a few cracks; no repeating compartments.

Which prediction about a living sample is supported by the model evidence?

  1. If you zoom in on Sample 1, the boundaries will disappear because living things cannot have boundaries inside them
  2. If you zoom in on Sample 1 even more, you would still expect to find more repeating bounded units in the tissue (correct answer)
  3. If you zoom in on Sample 2, you will definitely find cells because anything red is made of cells
  4. If you zoom in on Sample 2, the cracks will start moving, which proves it is living
Explanation: The core skill in life science is predicting characteristics of living things using cellular models. Cells are repeating, organized units separated by boundaries with internal dots or compartments. Diagrams at magnification provide evidence for such predictions by showing these features. Check by considering if zooming reveals more bounded units, not cracks or colors. A misconception is that color or movement upon closer look proves life without cellular patterns. This understanding of cellular organization supports accurate predictions about life. Ultimately, cells define life's structure, enabling functions in all organisms.

Question 2

Cells are the basis for determining whether something is living. Two simplified microscope views are shown side by side.

Sample A (Bread mold): many repeating round units with clear boundaries; some units appear connected in chains. Sample B (Dust from a shelf): mixed shapes and fragments; no consistent repeating units with clear boundaries.

Which sample provides evidence of being living based on the model you observed?

  1. Sample A, because chains mean it was built by people, and human-made things are living if they are organized
  2. Sample B, because it has many different shapes, and variety of shapes proves it is alive
  3. Sample A, because it shows repeating bounded units that suggest cellular organization (correct answer)
  4. Sample B, because dust is found everywhere in nature so it must be living
Explanation: The core skill in life science is observing cellular evidence to determine if a sample is living. Cells appear as repeating, organized units with boundaries, sometimes connected in chains. Microscope views provide evidence by contrasting these with mixed or fragmented shapes. A checking strategy is to seek consistent repeating units, not just variety in forms. One misconception is that human-made organization or natural ubiquity indicates life without cells. Cellular organization is key to classifying life correctly. In conclusion, this organization fundamentally defines what it means to be living.

Question 3

Cells are the basis for determining whether something is living. Look at the simplified microscope diagram with two labeled samples side by side.

Sample A (Onion skin): repeating brick-like units with clear boundaries; each unit has a darker region. Sample B (Paper towel fiber): long threads crossing; no repeating brick-like units with boundaries.

Which sample provides stronger evidence of being living based on the observed cellular organization?

  1. Sample A, because the label says 'onion,' and labels are enough to prove it is living
  2. Sample B, because paper towel is used to clean up living things, so it must be living too
  3. Sample A, because it shows repeating units with boundaries and internal organization (correct answer)
  4. Sample B, because fibers show that the material has parts and parts are the same as cells
Explanation: The core skill in life science is using cellular evidence to classify things as living. Cells are repeating, organized units with clear boundaries and darker regions indicating internal parts. Microscope models provide evidence by showing these brick-like or structured units in samples. A checking strategy involves examining for repeating patterns with boundaries, unlike threads or fibers without them. One misconception is that association with living things, like cleaning them, implies the material is living, but cellular structure must be observed. Cellular organization is crucial for distinguishing life accurately. Ultimately, this organization defines life across diverse organisms and environments.

Question 4

Cells are the basis for determining whether something is living. Two simplified microscope models are shown side by side.

Sample 1 (Pond water): many tiny repeating units with clear boundaries; several units show darker material inside. Sample 2 (Sugar crystals): sharp-edged shapes packed together; no repeating units with boundaries or darker material inside.

Which sample provides evidence of being living based on the model you observed?

  1. Sample 2, because crystals are organized and organization means it is living
  2. Sample 1, because it shows many repeating units with boundaries and internal parts (correct answer)
  3. Sample 2, because it is made of many small pieces so it must be made of cells
  4. Sample 1, because pond water can move and movement means it is living
Explanation: The core skill in life science is recognizing that all living things are made up of cells, which serve as the basic units of life. Cells are repeating, organized units with defined boundaries and often internal structures that perform specific functions. Models like microscope views provide evidence by magnifying these structures, showing whether a sample has cellular organization indicative of life. A checking strategy is to look for consistent repeating units with clear boundaries and internal parts, rather than irregular shapes or patterns. A common misconception is that any organized structure, like crystals, means something is living, but crystals lack the bounded internal organization of cells. This cellular organization is essential for processes like growth and reproduction in living things. Ultimately, the presence of cells distinguishes living organisms from non-living matter in our world.

Question 5

Cells are the basis for determining whether something is living. A student compares two model microscope views shown side by side.

Sample A (Leaf surface scrape): a sheet of repeating box-like units with thin boundaries; each unit contains a darker spot. Sample B (Plastic wrap): one smooth, continuous layer with wrinkles; no repeating units with boundaries.

Which claim is supported by the evidence shown in the models?

  1. Sample B is living because it is human-made but still very complex
  2. Sample A is living because it shows repeating units with boundaries and internal organization (correct answer)
  3. Sample A is living because it is green, and green things are always living
  4. Sample B is living because it has folds and surface patterns that look like parts
Explanation: The core skill in life science is understanding that living things are composed of cells, which are the fundamental building blocks of life. Cells appear as repeating, organized units with boundaries and internal components that enable life functions. Models such as diagrams under magnification provide evidence by revealing these units, helping to identify living samples. To check, scan for patterns of similar units with walls and darker internal areas, differentiating them from smooth or wrinkled surfaces. One misconception is that color alone, like green, indicates life, but cellular structure is the true evidence. Cellular organization allows living things to maintain structure and carry out activities. In summary, cells define life by providing the organized framework for all biological processes.

Question 6

Cells are the basis for determining whether something is living. A student observes two model microscope views.

Sample 1 (Cheek swab): scattered oval units; each has a boundary; many have a darker spot inside. Sample 2 (Fine glitter): shiny pieces with sharp edges; pieces vary in shape; no boundaries around repeating units with darker spots.

Which claim is supported by the evidence shown?

  1. Sample 2 is living because it sparkles, and living things often look bright
  2. Sample 1 is living because it shows many separate units with boundaries and internal organization (correct answer)
  3. Sample 2 is living because it is made of many tiny pieces, so each piece must be a cell
  4. Sample 1 is living because it came from a human, and anything from a human is automatically living even without evidence
Explanation: The core skill in life science is recognizing cellular structure as proof that something is living. Cells present as repeating, organized units with boundaries and often scattered with internal spots. Model views under microscopes provide evidence by highlighting these oval or distinct units. To check, identify separate units with internal organization, not just shiny or varying shapes. A misconception is that origin from a living source automatically means the sample is living without visible cells. Emphasizing cellular organization helps clarify what constitutes life. In essence, cells provide the defining framework for all living entities.

Question 7

Cells are the basis for determining whether something is living. A simplified model diagram shows two samples side by side.

Sample 1 (Mushroom tissue): tightly packed repeating units separated by thin lines; many units show darker material inside. Sample 2 (Foam packing material): many bubbles of different sizes; bubble walls touch and merge; no consistent internal darker material.

What evidence in the model indicates that Sample 1 is living?

  1. It has repeating units with boundaries and internal organization that repeat across the sample (correct answer)
  2. It is more complex-looking than foam, so it must be living
  3. It is a natural material, and natural things are always living
  4. It has many small spaces, and anything with small spaces is made of cells
Explanation: The core skill in life science is identifying living things through their cellular composition. Cells function as repeating, organized units with thin boundaries and internal materials that repeat consistently. Models like simplified diagrams provide evidence by illustrating these units, contrasting them with non-cellular materials. Check by looking for packed units with consistent internal darker areas, not just bubbles or spaces. A misconception is that complexity or natural origin alone means something has cells, but specific organization is required. This focus on cellular organization underscores its role in life's definition. In the end, cells are what make living things capable of essential functions like metabolism.

Question 8

Cells are the basis for determining whether something is living. A student compares two model microscope images: Sample 1 (pond algae) shows many small, repeated compartments with clear borders; Sample 2 (salt crystals) shows sharp angles and shiny shapes but no repeated closed compartments. Which sample provides evidence of being living based on the observed model?

  1. Sample 1, because it shows many repeated compartments with boundaries. (correct answer)
  2. Sample 2, because crystals are natural so they must be living.
  3. Sample 2, because sharp edges mean it is organized like life.
  4. Both samples, because anything seen under a microscope is made of cells.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than focusing on geometric shapes or shine. A common misconception is that sharp, angular patterns in crystals indicate cellular structure because they look organized, but cells require enclosed, repeating compartments. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 9

Cells are the basis for determining whether something is living. A student looks at two simplified microscope models: Sample A (mushroom tissue) shows many repeated, bubble-like units with boundaries; Sample B (glass) shows a uniform area with occasional cracks but no repeated bounded units. What evidence indicates that a sample is living in this model comparison?

  1. Having a shiny surface and reflecting light.
  2. Showing repeated bounded units that look like compartments across the sample. (correct answer)
  3. Having cracks, because cracks show the material changed.
  4. Being labeled as "mushroom tissue," because labels are proof.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than relying on surface properties or labels. A common misconception is that cracks, shine, or a sample's label prove it is living, but evidence must come from observed cellular structures. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 10

Cells are the basis for determining whether something is living. A student compares two model microscope images: Sample 1 (thin slice of stem) shows repeating compartments separated by boundaries; Sample 2 (paper) shows tangled fibers and empty spaces but no repeating closed compartments. Which claim is supported by the evidence shown?

  1. Sample 2 is living because paper comes from trees, which are living.
  2. Sample 1 is likely living because the model shows many repeating bounded compartments. (correct answer)
  3. Sample 2 is living because it has many layers and looks complex.
  4. Both are living because both have internal structure you can see.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than tangled features or origins. A common misconception is that materials derived from living things, like paper from trees, retain cellular evidence even without visible bounded units. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 11

Cells are the basis for determining whether something is living. A student claims: "Sample B is living because it has tiny dots inside it." In the model, Sample A (cheek swab) shows repeated oval compartments with boundaries and a darker region inside many of them; Sample B (pepper grains in water) shows scattered dots with no surrounding boundaries. Which claim is supported by the observed evidence shown?

  1. Sample B is living because tiny dots are always cells.
  2. Sample A is living because the model shows bounded compartments repeated across the sample. (correct answer)
  3. Both samples are living because they both contain small pieces.
  4. Sample B is living because pepper comes from a plant, so it must still be alive in water.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than scattered features without borders. A common misconception is that tiny dots or particles without boundaries indicate cells, especially if from a once-living source. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 12

Cells are the basis for determining whether something is living. Error detection: A student says, "Sample B must be living because it has straight lines that make a pattern." In the model, Sample A (skin tissue) shows many repeating bounded units; Sample B (printed ink on paper) shows straight lines and dots but no repeating closed compartments. Which statement best corrects the student using observed evidence from the model?

  1. Patterns like straight lines can be made without cells, so Sample B does not show evidence of being living in the model. (correct answer)
  2. Straight lines are a sign of life, so Sample B is living in the model.
  3. Sample B is living because ink is made from natural materials.
  4. Sample A is not living because living things cannot have repeated units.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than artificial patterns like printed lines. A common misconception is that man-made patterns, such as straight lines or dots, indicate cellular organization if they form a design. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 13

Cells are the basis for determining whether something is living. Two model microscope views are shown: Sample 1 (yeast in water) shows many similar, separate round units; Sample 2 (sugar dissolved in water) looks uniform with no repeated bounded units. Which prediction about a living sample is supported by the observed model evidence?

  1. Both samples are living because both are mixed with water.
  2. Sample 1 is more likely to be living because it is made of many repeated separate units with boundaries. (correct answer)
  3. Sample 2 is more likely to be living because it is perfectly smooth and even.
  4. Sample 2 will show clearer cells if you stir it faster, because movement creates cells.
Explanation: The core skill is determining whether something is living by identifying the presence of cells. Cells are repeating, organized units that form the structure of all living things, each with boundaries like membranes or walls that separate them. Models such as simplified microscope images provide evidence of life by revealing these patterns of repeated, bounded compartments that are characteristic of cellular organization. A useful checking strategy is to examine the model for consistent, enclosed units across the sample rather than uniform smoothness or mixing effects. A common misconception is that smoothness or dissolution in water indicates life, or that stirring can create visible cells. This cellular organization is essential for life's processes, including growth and energy use. Ultimately, the presence of such organized cells defines what is considered living in biology.

Question 14

Cells are the basis for determining whether something is living. A simplified microscope model shows two samples side by side: Sample A (bacteria from yogurt) and Sample B (powdered chalk). Sample A shows many tiny repeating units with boundaries. Sample B shows clumps and fragments with sharp edges but no repeating bounded units.

Which conclusion about life is incorrect based on the observed evidence in the model?

  1. Sample A provides evidence of being non-living because the units are too small to be living (correct answer)
  2. Sample B provides evidence of being non-living because it lacks cellular organization
  3. Sample A provides evidence of being living because it shows repeating bounded units
  4. The model supports using cell-like boundaries as evidence for life
Explanation: The ability to identify living things relies on recognizing cellular organization as the key evidence. Living organisms consist of cells, which appear as repeating units with clear boundaries regardless of their size. Microscope models demonstrate that even tiny organisms like bacteria show these bounded, repeating units while non-living materials lack this cellular organization. To evaluate evidence for life, look for repeating units with boundaries, understanding that cell size doesn't determine whether something is living. A misconception is that units can be too small to be living, but bacteria and other microorganisms have tiny cells that are definitely alive. The presence of cellular organization with bounded, repeating units defines all living things, from the largest organisms to the smallest microbes.

Question 15

Cells are the basis for determining whether something is living. A student observes a simplified microscope model of two samples side by side. Sample 1 (mushroom tissue) shows repeating rounded units separated by clear boundaries. Sample 2 (glass) shows a smooth, continuous area with a few cracks but no repeating rounded units.

What evidence indicates that Sample 1 is living?

  1. It has repeating units with boundaries, showing cellular organization (correct answer)
  2. It has cracks, so it must be made of parts like living things
  3. It is natural, so it must be living
  4. It looks more detailed than glass, so it must be living
Explanation: Identifying living things requires recognizing cellular organization as the key evidence. Living organisms are built from cells, which appear as repeating units with clear boundaries that create separate compartments. Microscope models reveal this cellular structure by showing how living tissues display these bounded, repeating units while non-living materials appear continuous or lack compartmentalized organization. To determine if a sample is living, look for multiple similar units with visible boundaries between them, not just cracks or surface features. A misconception is that being natural or having detail makes something living, but only cellular organization provides true evidence of life. The presence of cells with their characteristic bounded, repeating structure is what fundamentally defines all living things.

Question 16

A student says, "Cells are the basis for determining whether something is living." They examine a simplified microscope model showing two samples side by side. Sample 1 shows many similar repeating units with clear boundaries packed together. Sample 2 shows a smooth, continuous material with swirly streaks but no repeating boundaries. Based on the observed evidence in the model, which sample provides evidence of being living?

Use only the observed cellular organization in the model as evidence.

  1. Sample 2, because the swirly streaks show it is complex
  2. Sample 1, because it shows repeating units with boundaries like cells (correct answer)
  3. Sample 2, because it looks more "active" and less regular
  4. Sample 1, because it is made of many small parts so it must be living
Explanation: When determining if something is living, scientists look for cellular organization as the fundamental evidence. Cells appear as repeating units with clear boundaries that separate one cell from another, creating a pattern of distinct compartments. Microscope models help us visualize this cellular organization by showing how living tissues have these repeating bounded structures while non-living materials typically appear continuous or lack these compartmentalized units. To check if something shows evidence of life, look for multiple similar units with visible boundaries between them, not just any pattern or texture. A common misconception is that complexity, movement, or natural origin determines life, but the key evidence is cellular organization with bounded repeating units. This cellular structure is what fundamentally distinguishes living organisms from non-living materials, making it the primary criterion scientists use to identify life.

Question 17

Cells are the basis for determining whether something is living. A simplified microscope model shows two samples side by side. Sample A (unknown) shows repeating units with boundaries and some internal organization. Sample B (unknown) shows a random speckled pattern with no clear boundaries around repeating units.

Which claim is supported by the evidence shown in the model?

  1. Sample B is living because random speckles mean it is made of tiny living parts
  2. Sample A is living because it shows cellular organization in repeating bounded units (correct answer)
  3. Sample B is living because it looks more complicated than Sample A
  4. Both samples are living because both show some kind of pattern
Explanation: Identifying living things depends on observing cellular organization as the primary evidence. All living organisms are built from cells, which appear as repeating units with clear boundaries and often display internal organization. Microscope models reveal this fundamental difference by showing how living samples have these bounded, repeating units while non-living materials may show patterns but lack the compartmentalized structure of cells. To determine if something is living, look specifically for multiple similar units with visible boundaries between them, not just any pattern or complexity. A misconception is that complicated appearance or random patterns indicate life, but only cellular organization with bounded units provides true evidence. The presence of cells with their repeating, bounded structure is the universal characteristic that defines all living things, making it the most reliable criterion for identifying life.

Question 18

Cells are the basis for determining whether something is living. A simplified microscope model shows two samples side by side: Sample A (yeast mixture) and Sample B (sugar solution). In the model, Sample A shows many separate round units with clear boundaries. Sample B looks evenly shaded with no separate bounded units.

Which prediction about a living sample is supported by the model evidence?

  1. Sample B is living, so it should have repeating bounded units if viewed longer
  2. Sample A is living, so another view of it should still show repeating bounded units (correct answer)
  3. Sample A is non-living, because living things must look perfectly regular
  4. Sample B is living, because liquids are usually made of living things
Explanation: Using cellular organization to identify living things is a fundamental biological skill. Living organisms are composed of cells, which appear as repeating units with clear boundaries that create distinct compartments. Microscope models demonstrate this principle by showing how living samples maintain their cellular structure with bounded, repeating units regardless of viewing angle or time. To predict whether a sample is living, look for these cellular compartments with boundaries, understanding that living samples will consistently show this organization. A misconception is that liquids or perfect regularity determine life status, but the key indicator is the presence of bounded cellular units. The consistent presence of cellular organization across all views and samples is what defines living things and distinguishes them from non-living materials.

Question 19

Cells are the basis for determining whether something is living. A simplified microscope model shows two samples side by side: Sample X (skin scraping) and Sample Y (metal foil). Sample X shows many repeating units with boundaries and small structures inside some units. Sample Y shows a uniform sheet with wrinkles but no repeating bounded units.

Which sample provides evidence of being living?

  1. Sample Y, because wrinkles show it can change shape like living things
  2. Sample Y, because metal is made of tiny pieces so it must be living
  3. Sample X, because it shows repeating bounded units with internal organization (correct answer)
  4. Sample X, because it is from a human so the label proves it is living
Explanation: Determining whether something is living depends on observing cellular organization as the primary evidence. Living things consist of cells, which appear as repeating units with clear boundaries and often show internal organization within each unit. Microscope models help visualize this cellular structure by displaying how living tissues have these bounded, repeating compartments while non-living materials like metal show continuous surfaces or patterns without cellular boundaries. When examining samples, focus on finding multiple similar units with boundaries between them, along with possible internal structures. A common mistake is thinking that ability to change shape or being made of tiny pieces indicates life, but only cellular compartments provide reliable evidence. This cellular organization with bounded, repeating units is the universal characteristic that identifies all living organisms.

Question 20

Cells are the basis for determining whether something is living. Two students look at a simplified microscope model of two samples side by side: Sample 1 (flower petal tissue) and Sample 2 (colored paper). Sample 1 shows repeating compartments with boundaries; Sample 2 shows layered fibers and dye spots but no repeating compartments.

Which sample provides evidence of being living?

  1. Sample 2, because it has layers that look organized
  2. Sample 2, because the dye spots look like internal parts
  3. Sample 1, because it shows repeating bounded compartments like cells (correct answer)
  4. Sample 1, because flower petals have a job, so they must be living
Explanation: Determining whether something is living requires recognizing cellular organization as the fundamental evidence. Living tissues are composed of cells, which appear as repeating compartments with clear boundaries that create distinct units. Microscope models help distinguish living from non-living by showing how living samples like flower petals have these bounded, repeating compartments while non-living materials may have layers or spots but lack cellular organization. When examining samples, focus on finding multiple similar compartments with boundaries, not just organized appearance or function. A common mistake is thinking that having a purpose or looking organized indicates life, but only cellular compartments provide reliable evidence. This cellular structure with its characteristic bounded, repeating units is what defines all living organisms and separates them from non-living materials.