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Cell Biology MCQs

Practice important Cell Biology MCQs with answers, explanations, theory links, and exam-focused preparation.

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Cell Biology

Cell Biology MCQs With Answers

Only MCQs mapped to Cell Biology are shown on this page.

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CSS - PMS - CCE - PCS - General Science Cell Biology
Which structure is present in plant cells but absent from animal cells and provides rigid support?
A. Cytoplasm
B. Ribosome
C. Plasma membrane
D. Cell wall
Correct Answer: D
Plant cell walls, largely made of cellulose, provide mechanical support.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which organelle contains digestive enzymes and helps break down cellular waste?
A. Nucleus
B. Ribosome
C. Centriole only
D. Lysosome
Correct Answer: D
Lysosomes contain hydrolytic enzymes for intracellular digestion.
CSS - PMS - CCE - PCS - General Science Cell Biology
What is osmosis?
A. Net movement of water across a selectively permeable membrane from higher water potential to lower water potential
B. Breakdown of glucose without enzymes
C. Division of a nucleus
D. Movement of proteins against gravity only
Correct Answer: A
Osmosis is passive water movement driven by differences in water potential.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which organelle carries out photosynthesis in plant cells?
A. Golgi apparatus
B. Mitochondrion only
C. Chloroplast
D. Lysosome
Correct Answer: C
Chloroplasts contain chlorophyll and photosynthetic machinery.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which structure selectively controls movement of substances into and out of the cell?
A. Cell wall only
B. Chromosome
C. Plasma membrane
D. Nucleolus
Correct Answer: C
The cell membrane is selectively permeable and regulates transport.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which organelle modifies, sorts and packages proteins for transport?
A. Chloroplast
B. Mitochondrion
C. Golgi apparatus
D. Nucleolus
Correct Answer: C
The Golgi apparatus processes and packages proteins and lipids.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which structure is the main site of protein synthesis?
A. Centrosome
B. Cell wall
C. Lysosome
D. Ribosome
Correct Answer: D
Ribosomes translate mRNA into polypeptide chains.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which organelle is the main site of ATP production by aerobic respiration?
A. Mitochondrion
B. Nucleus
C. Ribosome
D. Vacuole
Correct Answer: A
Mitochondria generate most cellular ATP through oxidative phosphorylation.
CSS - PMS - CCE - PCS - General Science Cell Biology
Which organelle contains most of the genetic material in a eukaryotic cell?
A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Nucleus
Correct Answer: D
The nucleus contains the cell's chromosomes in eukaryotes.
CSS - PMS - CCE - PCS - General Science Cell Biology
What is the basic structural and functional unit of life?
A. Cell
B. Organ
C. Atom
D. Tissue
Correct Answer: A
All living organisms are composed of one or more cells, the basic units of life.
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