Cell Types and Numbers - Middle School Life Science
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Which statement best describes cell types in a unicellular organism?
Which statement best describes cell types in a unicellular organism?
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One cell type carries out all life processes. No specialization needed when there's only one cell.
One cell type carries out all life processes. No specialization needed when there's only one cell.
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What is the main advantage of being multicellular compared with being unicellular?
What is the main advantage of being multicellular compared with being unicellular?
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Specialized cells can perform different functions. Division of labor allows efficiency and complex structures.
Specialized cells can perform different functions. Division of labor allows efficiency and complex structures.
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Identify the correct pairing: unicellular or multicellular for a human.
Identify the correct pairing: unicellular or multicellular for a human.
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Multicellular. Humans have trillions of specialized cells.
Multicellular. Humans have trillions of specialized cells.
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Which group is always unicellular: bacteria, plants, or animals?
Which group is always unicellular: bacteria, plants, or animals?
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Bacteria. All bacteria are single-celled prokaryotes.
Bacteria. All bacteria are single-celled prokaryotes.
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Identify the correct pairing: unicellular or multicellular for a single-celled yeast.
Identify the correct pairing: unicellular or multicellular for a single-celled yeast.
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Unicellular. Yeast is a single-celled fungus.
Unicellular. Yeast is a single-celled fungus.
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Which option best fits: A cell that contracts to move bones is a(n) ____ cell.
Which option best fits: A cell that contracts to move bones is a(n) ____ cell.
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Muscle cell. Specialized for contraction and movement.
Muscle cell. Specialized for contraction and movement.
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Which option best fits: A cell that carries oxygen through blood is a(n) ____ cell.
Which option best fits: A cell that carries oxygen through blood is a(n) ____ cell.
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Red blood cell. Contains hemoglobin for oxygen transport.
Red blood cell. Contains hemoglobin for oxygen transport.
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What is the defining feature of a eukaryotic cell compared with a prokaryotic cell?
What is the defining feature of a eukaryotic cell compared with a prokaryotic cell?
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It has a nucleus and membrane-bound organelles. DNA is enclosed in nucleus; organelles compartmentalize functions.
It has a nucleus and membrane-bound organelles. DNA is enclosed in nucleus; organelles compartmentalize functions.
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What is the defining feature of a prokaryotic cell compared with a eukaryotic cell?
What is the defining feature of a prokaryotic cell compared with a eukaryotic cell?
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It lacks a nucleus and membrane-bound organelles. DNA floats freely in cytoplasm without membrane separation.
It lacks a nucleus and membrane-bound organelles. DNA floats freely in cytoplasm without membrane separation.
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Which two major cell categories distinguish organisms such as bacteria from animals and plants?
Which two major cell categories distinguish organisms such as bacteria from animals and plants?
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Prokaryotic cells and eukaryotic cells. Basic cell structure differs between these groups.
Prokaryotic cells and eukaryotic cells. Basic cell structure differs between these groups.
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Which statement best describes cell types in a multicellular organism?
Which statement best describes cell types in a multicellular organism?
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Many specialized cell types share the work. Specialization allows complex functions and efficiency.
Many specialized cell types share the work. Specialization allows complex functions and efficiency.
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What is the term for a structure made of different tissues working together?
What is the term for a structure made of different tissues working together?
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Organ. Examples include the heart (muscle and nerve tissues) and stomach.
Organ. Examples include the heart (muscle and nerve tissues) and stomach.
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What is the term for a group of organs working together to carry out major functions?
What is the term for a group of organs working together to carry out major functions?
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Organ system. Examples include the digestive system and circulatory system.
Organ system. Examples include the digestive system and circulatory system.
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Identify the correct statement: cell specialization is more common in unicellular or multicellular organisms.
Identify the correct statement: cell specialization is more common in unicellular or multicellular organisms.
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Multicellular organisms. Only multicellular organisms have enough cells to specialize.
Multicellular organisms. Only multicellular organisms have enough cells to specialize.
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What is the relationship between organism size and cell number in most multicellular organisms?
What is the relationship between organism size and cell number in most multicellular organisms?
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Larger organisms usually have more cells. More cells are needed to build bigger bodies, not bigger cells.
Larger organisms usually have more cells. More cells are needed to build bigger bodies, not bigger cells.
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What is the term for the process in which cells become different types with different functions?
What is the term for the process in which cells become different types with different functions?
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Cell differentiation. Stem cells differentiate into specialized cells during development.
Cell differentiation. Stem cells differentiate into specialized cells during development.
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Which option is correct for humans: one cell type or many specialized cell types?
Which option is correct for humans: one cell type or many specialized cell types?
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Many specialized cell types. Humans have over 200 different cell types, including neurons and muscle cells.
Many specialized cell types. Humans have over 200 different cell types, including neurons and muscle cells.
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Identify the best description of a bacterium: unicellular or multicellular organism?
Identify the best description of a bacterium: unicellular or multicellular organism?
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Unicellular organism. Bacteria are single-celled microorganisms.
Unicellular organism. Bacteria are single-celled microorganisms.
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Identify the best description of most plants: unicellular or multicellular organisms?
Identify the best description of most plants: unicellular or multicellular organisms?
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Multicellular organisms. Plants have roots, stems, and leaves made of many cells.
Multicellular organisms. Plants have roots, stems, and leaves made of many cells.
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Choose the word that completes the sequence: cells form tissues, tissues form ___, and organs form systems.
Choose the word that completes the sequence: cells form tissues, tissues form ___, and organs form systems.
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Organs. This is the hierarchy of organization in multicellular organisms.
Organs. This is the hierarchy of organization in multicellular organisms.
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Which option best explains why multicellular organisms can be more complex than unicellular organisms?
Which option best explains why multicellular organisms can be more complex than unicellular organisms?
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They have many specialized cell types and levels of organization. Specialization allows division of labor and complex structures.
They have many specialized cell types and levels of organization. Specialization allows division of labor and complex structures.
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What is the term for an organism made of exactly one cell?
What is the term for an organism made of exactly one cell?
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Unicellular organism. The prefix 'uni-' means one, so unicellular means one-celled.
Unicellular organism. The prefix 'uni-' means one, so unicellular means one-celled.
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What is the term for an organism made of many cells?
What is the term for an organism made of many cells?
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Multicellular organism. The prefix 'multi-' means many, so multicellular means many-celled.
Multicellular organism. The prefix 'multi-' means many, so multicellular means many-celled.
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Which option best describes how cell type relates to function in multicellular organisms?
Which option best describes how cell type relates to function in multicellular organisms?
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Different cell types have different functions. Structure determines function - nerve cells transmit, muscle cells contract.
Different cell types have different functions. Structure determines function - nerve cells transmit, muscle cells contract.
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Identify whether the organism is unicellular or multicellular: a yeast cell living independently.
Identify whether the organism is unicellular or multicellular: a yeast cell living independently.
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Unicellular. Yeast can live and reproduce as individual cells.
Unicellular. Yeast can live and reproduce as individual cells.
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