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,Biology Mastery: High-Yield Questions with Rationales, 5th Edition
• Which organelle is responsible for ATP production in a cell?
A. Ribosome
B. Mitochondria
C. Golgi apparatus
D. Lysosome
Correct Answer: B
Rationale: Mitochondria are the powerhouse of the cell and generate ATP through
cellular respiration.

• Which phase of mitosis is characterized by separation of sister chromatids?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct Answer: C
Rationale: During anaphase, sister chromatids separate and move toward opposite
poles.

• DNA replication occurs during which phase of the cell cycle?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct Answer: B
Rationale: The S phase is responsible for synthesis of DNA before cell division.

• Which type of RNA carries amino acids to the ribosome?
A. mRNA
B. rRNA
C. tRNA
D. snRNA
Correct Answer: C
Rationale: Transfer RNA transports specific amino acids during protein synthesis.

• Which enzyme is responsible for unzipping DNA during replication?
A. DNA polymerase
B. RNA polymerase
C. Helicase

,D. Ligase
Correct Answer: C
Rationale: Helicase breaks hydrogen bonds between DNA strands.

• Which blood cells are primarily responsible for immunity?
A. Red blood cells
B. Platelets
C. White blood cells
D. Plasma cells
Correct Answer: C
Rationale: White blood cells defend the body against infection and foreign
antigens.

• Which hormone regulates blood glucose levels by lowering them?
A. Glucagon
B. Cortisol
C. Insulin
D. Epinephrine
Correct Answer: C
Rationale: Insulin promotes uptake of glucose into cells, reducing blood sugar
levels.

• Which structure controls the passage of substances into and out of the cell?
A. Cell wall
B. Cytoplasm
C. Plasma membrane
D. Nucleus
Correct Answer: C
Rationale: The plasma membrane is selectively permeable and regulates transport.

• Which process moves substances from low concentration to high concentration?
A. Diffusion
B. Osmosis
C. Active transport
D. Filtration
Correct Answer: C
Rationale: Active transport requires energy to move substances against the
gradient.

, • Which organ is the primary site of detoxification in the human body?
A. Kidney
B. Liver
C. Lung
D. Spleen
Correct Answer: B
Rationale: The liver metabolizes drugs, toxins, and waste products.

• Which vitamin is essential for blood clotting?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Correct Answer: D
Rationale: Vitamin K is required for synthesis of clotting factors.

• Which gas is exchanged at the alveoli of the lungs?
A. Nitrogen
B. Oxygen and carbon dioxide
C. Carbon monoxide
D. Hydrogen
Correct Answer: B
Rationale: Alveoli allow diffusion of oxygen into blood and carbon dioxide out.

• Which part of the brain controls balance and coordination?
A. Cerebrum
B. Medulla oblongata
C. Cerebellum
D. Hypothalamus
Correct Answer: C
Rationale: The cerebellum regulates posture, balance, and coordinated movement.

• Which enzyme begins protein digestion in the stomach?
A. Trypsin
B. Pepsin
C. Amylase
D. Lipase
Correct Answer: B
Rationale: Pepsin breaks proteins into smaller peptides in acidic conditions.