Cell Biology Practice Questions
GCSE · GCSE Biology · 136 free MCQs with instant results and detailed explanations.
136
Total
36
Easy
74
Medium
26
Hard
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Sample Questions from Cell Biology
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Q1
Easy
Which part of the cell is responsible for controlling what enters and exits the cell?
A.
Nucleus
B.
Cell Membrane
C.
Cytoplasm
D.
Mitochondria
Show Answer & Explanation
Correct Answer: B
The cell membrane is a semi-permeable barrier that regulates the movement of substances in and out of the cell, making option B the correct choice.
Q2
Easy
Which of the following statements about mitochondria is correct?
A.
They are the site of photosynthesis.
B.
They produce energy in the form of ATP.
C.
They contain genetic material only.
D.
They are found only in plant cells.
Show Answer & Explanation
Correct Answer: B
Mitochondria are known as the powerhouses of the cell because they produce ATP (adenosine triphosphate), which is the main energy currency of cells, thus option B is correct.
Q3
Easy
What is the primary function of ribosomes in a cell?
A.
Energy production
B.
Protein synthesis
C.
Cell division
D.
Storage of genetic information
Show Answer & Explanation
Correct Answer: B
Ribosomes are the cellular structures responsible for synthesizing proteins by translating messenger RNA (mRNA), making option B the correct answer.
Q4
Medium
Which of the following best describes the primary function of ribosomes in a cell?
A.
They synthesize proteins.
B.
They store genetic information.
C.
They generate energy.
D.
They transport substances.
Show Answer & Explanation
Correct Answer: A
Ribosomes are the cell's protein synthesis machinery, translating messenger RNA into polypeptide chains, hence they primarily synthesize proteins.
Q5
Medium
What would happen to a plant cell placed in a hypertonic solution?
A.
It would swell and burst.
B.
It would remain unchanged.
C.
It would shrivel.
D.
It would become turgid.
Show Answer & Explanation
Correct Answer: C
In a hypertonic solution, water moves out of the plant cell, causing it to lose turgor pressure and shrivel.
Q6
Medium
Which component of the cell membrane is primarily responsible for its fluidity?
A.
Proteins
B.
Phospholipids
C.
Carbohydrates
D.
Cholesterol
Show Answer & Explanation
Correct Answer: B
Phospholipids form a bilayer, allowing for fluidity of the cell membrane by enabling lateral movement within the layer.
Q7
Medium
In what stage of the cell cycle does DNA replication occur?
A.
G1 phase
B.
S phase
C.
G2 phase
D.
M phase
Show Answer & Explanation
Correct Answer: B
DNA replication takes place during the S phase of the cell cycle, where each chromosome is duplicated.
Q8
Hard
Which of the following statements best describes the role of ribosomes in a cell?
A.
Ribosomes synthesize proteins by translating mRNA.
B.
Ribosomes are responsible for DNA replication.
C.
Ribosomes produce ATP for cellular energy.
D.
Ribosomes store genetic information.
Show Answer & Explanation
Correct Answer: A
Ribosomes are the cellular machinery that translates messenger RNA (mRNA) into protein, which is essential for cell function and structure.
Q9
Hard
In a hypothetical experiment, a plant cell is placed in a hypertonic solution. What will likely happen to the cell?
A.
The cell will swell and burst due to osmosis.
B.
The cell will lose water and undergo plasmolysis.
C.
The cell will remain unchanged as it is isotonic.
D.
The cell will absorb water and increase in turgor pressure.
Show Answer & Explanation
Correct Answer: B
When a plant cell is placed in a hypertonic solution, water moves out of the cell through osmosis, causing the cell to shrink and undergo plasmolysis, which is the separation of the plasma membrane from the cell wall.
Q10
Hard
Which organelle is primarily responsible for ATP production in eukaryotic cells?
A.
Chloroplast
B.
Mitochondrion
C.
Ribosome
D.
Endoplasmic Reticulum
Show Answer & Explanation
Correct Answer: B
The mitochondrion is known as the powerhouse of the cell because it is the site of ATP production through cellular respiration, making it crucial for energy metabolism.
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Cell Biology — GCSE GCSE Biology Practice Questions Online
This page contains 136 practice MCQs for the chapter Cell Biology in GCSE GCSE Biology. The questions are organized by difficulty — 36 easy, 74 medium, 26 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.