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Cell biology
9 Class 11 Biology questions with answers and explanations.
Printable worksheet with answer key
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The fluid mosaic model describes the structure of the:
- 1 Cell wall
- 2 Cell membrane
- 3 Nucleus
- 4 Mitochondrion
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Correct answer: Cell membrane
It shows a phospholipid bilayer with proteins embedded in it.
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Movement of water across a semipermeable membrane is called:
- 1 Diffusion of solutes only
- 2 Phagocytosis
- 3 Osmosis
- 4 Active transport
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Correct answer: Osmosis
Osmosis is the diffusion of water across a selectively permeable membrane.
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Active transport requires:
- 1 Only heat
- 2 No energy
- 3 Only light
- 4 ATP
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Correct answer: ATP
It moves substances against a concentration gradient and uses ATP.
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Which organelle contains digestive enzymes?
- 1 Vacuole only
- 2 Lysosome
- 3 Ribosome
- 4 Centriole
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Correct answer: Lysosome
Lysosomes digest worn out parts and engulfed material.
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Rough endoplasmic reticulum is rough because of attached:
- 1 Lipids
- 2 Ribosomes
- 3 Chloroplasts
- 4 Mitochondria
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Correct answer: Ribosomes
Ribosomes on its surface give it a rough appearance.
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A cell placed in a hypotonic solution will:
- 1 Divide
- 2 Shrink
- 3 Swell
- 4 Stay the same
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The cell membrane is mainly made of:
- 1 Starch
- 2 Cellulose
- 3 Chitin
- 4 Phospholipids and proteins
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Correct answer: Phospholipids and proteins
This is the fluid mosaic model.
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The site of protein modification and packaging is the:
- 1 Ribosome
- 2 Golgi apparatus
- 3 Lysosome
- 4 Nucleolus
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Correct answer: Golgi apparatus
The Golgi body modifies and packages proteins.
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Which organelle has its own DNA?
- 1 Mitochondrion
- 2 Ribosome
- 3 Golgi body
- 4 Lysosome
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Correct answer: Mitochondrion
Mitochondria and chloroplasts contain DNA.