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Biology Questions

Found 9 practice questions from various admission tests.

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1. Which organelle is known as the 'powerhouse of the cell'?

Medical Admission Mock Test
A. Golgi apparatus
B. Mitochondria✓ Correct
C. Endoplasmic reticulum
D. Nucleus
Explanation: Mitochondria generate most of the cell's supply of ATP through oxidative phosphorylation.

2. DNA replication is:

Medical Admission Mock Test
A. Conservative
B. Semi-conservative✓ Correct
C. Dispersive
D. Non-conservative
Explanation: Meselson and Stahl's experiment proved DNA replication is semi-conservative.

3. Which blood group is called the universal donor?

Medical Admission Mock Test
A. A
B. B
C. AB
D. O✓ Correct
Explanation: Blood group O has no A or B antigens, so it can be donated to any group.

4. The functional unit of the kidney is:

Medical Admission Mock Test
A. Neuron
B. Nephron✓ Correct
C. Alveolus
D. Villus
Explanation: Each kidney contains about 1 million nephrons that filter blood.

5. Crossing over occurs during which stage of meiosis?

Medical Admission Mock Test
A. Prophase I✓ Correct
B. Metaphase I
C. Anaphase I
D. Telophase I
Explanation: Crossing over between homologous chromosomes occurs during Prophase I (pachytene).

6. Which hormone is secreted by the Islets of Langerhans?

Medical Admission Mock Test
A. Thyroxine
B. Adrenaline
C. Insulin✓ Correct
D. Estrogen
Explanation: Beta cells of the Islets of Langerhans in the pancreas secrete insulin.

7. Photosynthesis occurs in which part of the plant cell?

Medical Admission Mock Test
A. Mitochondria
B. Ribosome
C. Chloroplast✓ Correct
D. Vacuole
Explanation: Chloroplasts contain chlorophyll which captures light energy for photosynthesis.

8. Which vitamin is essential for blood clotting?

Medical Admission Mock Test
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K✓ Correct
Explanation: Vitamin K is required for the synthesis of prothrombin and other clotting factors.

9. Which part of the human brain controls body temperature?

DU A-Unit (Science) Mock
A. Cerebrum
B. Cerebellum
C. Medulla Oblongata
D. Hypothalamus✓ Correct
Explanation: The hypothalamus is responsible for thermoregulation.