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AP Intermediate 1st Year Cell: The Unit of Life — practice questions

Explore 38 free Cell: The Unit of Life questions in AP Intermediate 1st Year Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Cell: The Unit of Life questions and exercises with answers

Showing questions 1–30 of 38.

The statement *omnis cellula e cellula* ('every cell arises from a pre-existing cell') was contributed byRead the answer and worked solution →The defining structural feature that separates eukaryotic cells from prokaryotic cells isRead the answer and worked solution →The smallest known living cell isRead the answer and worked solution →The ribosomes of prokaryotic cells are designated asRead the answer and worked solution →The small circular DNA molecules found in bacteria, outside the main chromosome, are calledRead the answer and worked solution →Which of the following bacterial surface structures is primarily involved in motility?Read the answer and worked solution →Mesosomes in prokaryotic cells help inRead the answer and worked solution →The fluid mosaic model of the cell membrane was proposed byRead the answer and worked solution →Which of the following is NOT considered part of the endomembrane system?Read the answer and worked solution →Smooth endoplasmic reticulum is mainly the site ofRead the answer and worked solution →The inner membrane of a mitochondrion is folded intoRead the answer and worked solution →Mitochondria and chloroplasts share which of the following features with bacteria?Read the answer and worked solution →The microtubule arrangement in the axoneme of eukaryotic cilia and flagella isRead the answer and worked solution →Inside a chloroplast, a stack of disc-shaped thylakoid sacs is called aRead the answer and worked solution →Which is NOT one of the three claims of cell theory?Read the answer and worked solution →The smallest known cell As per your syllabus, isRead the answer and worked solution →An example of an unusually large single cell visible to the naked eye isRead the answer and worked solution →In prokaryotes, the inward folding of the plasma membrane that handles respiration, DNA replication and cell-wall synthesis is theRead the answer and worked solution →Bacteria that retain the crystal-violet Gram stain and appear purple are classified asRead the answer and worked solution →Rough ER differs from smooth ER in thatRead the answer and worked solution →Mitochondria and chloroplasts share which key features?Read the answer and worked solution →Cilia and flagella share which internal microtubule arrangement?Read the answer and worked solution →The nucleolus inside the nucleus is responsible forRead the answer and worked solution →Ribosome sizes areRead the answer and worked solution →The term 'cell' was coined in 1665 by:Read the answer and worked solution →Prokaryotic cells DIFFER from eukaryotic cells in that prokaryotes:Read the answer and worked solution →A structure UNIQUE to plant cells (NOT found in animal cells) is the:Read the answer and worked solution →Mitochondria are called the 'POWERHOUSE OF THE CELL' because they:Read the answer and worked solution →The Rough Endoplasmic Reticulum (RER) has its ribosomes attached to perform:Read the answer and worked solution →Chromoplasts in plants are responsible for:Read the answer and worked solution →

Worked practice questions

The statement *omnis cellula e cellula* ('every cell arises from a pre-existing cell') was contributed by

  1. Schleiden
  2. Schwann
  3. Virchow
  4. Leeuwenhoek
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Correct answer: C. Virchow

Rudolf Virchow added this third pillar to the cell theory in 1855. Schleiden and Schwann had observed that plants and animals are made of cells, but couldn't explain cell origin. Virchow's contribution settled the question and completed the theory.

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The defining structural feature that separates eukaryotic cells from prokaryotic cells is

  1. the presence of ribosomes
  2. the presence of DNA
  3. the presence of cytoplasm
  4. a membrane-bound nucleus
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Correct answer: D. a membrane-bound nucleus

Both cell types have DNA, ribosomes, cytoplasm and a plasma membrane. What sets eukaryotes apart is the **membrane-bound nucleus** and the suite of membrane-bound organelles (ER, Golgi, mitochondria, etc.) that follow from it.

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The smallest known living cell is

  1. Mycoplasma
  2. Escherichia coli
  3. Human red blood cell
  4. Yeast
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Correct answer: A. Mycoplasma

Mycoplasma cells, only about 0.3 μm across, are the smallest known cells. They lack a cell wall, which is why they can be so tiny. Compare with typical bacteria at 3-5 μm and animal cells at 10-20 μm.

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More Biology topics

The Living World & Biological ClassificationPhotosynthesis in Higher PlantsAnimal KingdomBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionLocomotion and MovementNeural Control and Chemical Coordination