All flashcards
Flashcard 1: What is the key difference between unicellular and multicellular organisms?
Answer: Unicellular have 1 cell; multicellular have many cells. The number of cells distinguishes these two organism types.
Flashcard 2: What is the correct conclusion if a sample contains cytoplasm and ribosomes inside a membrane?
Answer: Living (cell components are present). These cellular components together indicate a living cell.
Flashcard 3: Which option is cellular evidence that a microbe is living: it has cells or it is magnetic?
Answer: It has cells. Only living things have cells; magnetism is a physical property.
Flashcard 4: What is the correct cellular classification of a virus in middle school life science?
Answer: Nonliving by cellular evidence (not made of cells). Viruses lack cellular structure despite having genetic material.
Flashcard 5: Which option is the best cellular evidence that an object was once living: fossilized cells or smooth glass?
Answer: Fossilized cells. Fossils preserve cell structures from once-living organisms.
Flashcard 6: What is the correct classification if a sample shows only mineral crystals and no cells?
Answer: Nonliving (no cells are present). Minerals form crystals but never contain cellular structures.
Flashcard 7: What is the correct classification if a microscope shows many membrane-bound cells in a sample?
Answer: Living (cells are present). Membrane-bound cells prove the sample contains living material.
Flashcard 8: Which option is cellular evidence of an animal cell: cell wall or no cell wall?
Answer: No cell wall. Animal cells have only cell membranes, not rigid cell walls.
Flashcard 9: What structure provides strong cellular evidence that a cell is from a plant or fungus?
Answer: Cell wall. Cell walls provide rigid support in plants and fungi but not animals.
Flashcard 10: Which option is cellular evidence of a plant cell: chloroplast, centriole, or none?
Answer: Chloroplast. Only plant cells contain chloroplasts for photosynthesis.
Flashcard 11: What organelle is a strong cellular clue that a sample is from a plant?
Answer: Chloroplast. Chloroplasts perform photosynthesis and are unique to plant cells.
Flashcard 12: Which option is cellular evidence of a prokaryote: DNA in a nucleus or DNA in cytoplasm?
Answer: DNA in cytoplasm. Prokaryotes store their DNA freely in the cytoplasm without a nucleus.
Flashcard 13: What is the difference between a prokaryotic cell and a eukaryotic cell?
Answer: Prokaryotic lack a nucleus; eukaryotic have a nucleus. The presence or absence of a nucleus defines these cell types.
Flashcard 14: Which option is cellular evidence of life: nucleus, sand grain, or glass shard?
Answer: Nucleus. The nucleus is an organelle found only in living eukaryotic cells.
Flashcard 15: Which structure is found in all cells and is strong evidence of life?
Answer: Cell membrane. Every living cell must have a membrane to control what enters and exits.
Flashcard 16: Which option is a unicellular living thing: bacterium, granite rock, or plastic bead?
Answer: Bacterium. Bacteria are single-celled organisms, while rocks and plastic lack cells.
Flashcard 17: What is the cellular evidence rule used to classify something as living?
Answer: Living things are made of one or more cells. This is the fundamental rule that defines life at the cellular level.
Flashcard 18: Which option is cellular evidence of life: cell membrane, crystal lattice, or metal alloy?
Answer: Cell membrane. Cell membranes are essential structures found only in living cells.
Flashcard 19: What is the best cellular evidence that something is nonliving?
Answer: It has no cells and no cellular structures. Absence of cells is the definitive proof of nonliving matter.
Flashcard 20: What is the correct classification if an object shows growth but has no cells (example: a crystal)?
Answer: Nonliving. Growth alone doesn't indicate life; cells are required.
Flashcard 21: Which option is living based on cellular evidence: a seed or a pebble?
Answer: A seed. Seeds contain plant embryos with cells; pebbles are nonliving minerals.
Flashcard 22: What is the correct term for a group of similar cells working together?
Answer: Tissue. Cells organize into tissues for specialized functions.
Flashcard 23: Identify the correct classification by cells: a dead leaf is living or nonliving now?
Answer: Nonliving now (it was living). Dead organisms no longer perform life functions despite having cells.
Flashcard 24: Which observation best supports that something is living: cells present or only movement observed?
Answer: Cells present. Movement can be nonliving (wind, water); cells prove life.
Flashcard 25: What is the main function of the nucleus in many cells?
Answer: It contains DNA and controls cell activities. The nucleus is the control center containing genetic material.
Flashcard 26: What cellular feature do plants have that animal cells do not have?
Answer: A cell wall (and usually chloroplasts). Plant cells have rigid walls for support and chloroplasts for photosynthesis.
Flashcard 27: Which option is living based on cellular evidence: a virus or a bacterium?
Answer: A bacterium. Bacteria have cells; viruses lack cellular structure.
Flashcard 28: What is the key cellular evidence used to classify something as living?
Answer: The presence of one or more cells. All living things are made of cells; nonliving things lack cells.
Flashcard 29: Which option is living based on cellular evidence: a rock or a bacterium?
Answer: A bacterium. Bacteria are single-celled organisms; rocks have no cells.
Flashcard 30: Which option is nonliving based on cellular evidence: a crystal or yeast?
Answer: A crystal. Crystals lack cells; yeast is a single-celled fungus.