1st Year Biology Chapter 6 TestBioenergetics

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. How much energy is released by breaking one phosphate bond in ATP?

   1. 2 kcal/mole

   2. 4.6 kcal/mole

   3. 7.3 kcal/mole

   4. 10 kcal/mole

2. What is the function of the antenna complex in a photosystem?

   1. Produces glucose

   2. Absorbs CO2

   3. Captures light and passes energy to the reaction centre

   4. Breaks water molecules

3. What molecule receives electrons from PS-I's primary acceptor?

   1. Plastocyanin

   2. ATP

   3. Ferredoxin (FD)

   4. ADP

4. What is the first compound formed in the Krebs cycle?

   1. Malic acid

   2. Citric acid

   3. Succinic acid

   4. Acetaldehyde

5. Which molecule donates a phosphate group to ADP during the last step of glycolysis?

   1. Glucose

   2. Pyruvic acid

   3. Phosphoenol pyruvic acid (PEP)

   4. Acetyl CoA

6. What is released when acetyl-CoA splits in Krebs cycle?

   1. CO₂

   2. ATP

   3. Coenzyme A

   4. NAD⁺

7. What is the first stable intermediate in glycolysis?

   1. Fructose-6-phosphate

   2. Glucose-6-phosphate

   3. Glyceraldehyde-3-phosphate

   4. Dihydroxyacetone phosphate

8. What does NADPH do in photosynthesis?

   1. Captures sunlight

   2. Opens stomata

   3. Acts as reducing power for CO2

   4. Stores water

9. When do CAM plants open their stomata?

   1. During the day

   2. During the night

   3. Continuously

   4. Only in the morning

10. What happens when RuBisCO binds oxygen instead of CO₂?

    1. Production of glucose

    2. Breakdown of RuBP into phosphoglycerate and phosphoglycolate

    3. Increase in ATP production

    4. Direct synthesis of glycerate