9th class Biology, Chapter 7: Bioenergetics MCQs

1. When we get energy from ATP, which bonds are broken?

1. (A) P-P bonds ✓
2. (B) C-H bonds
3. (C) C-N bonds
4. (D) C-O bonds

2. Light reactions of photosynthesis occur in:

1. (A) Plasma membrane of cell
2. (B) Cytoplasm of cell
3. (C) Stroma of chloroplasts
4. (D) Thylakoids of chloroplasts ✓

3. Which wavelengths of light are absorbed to maximum by chlorophylls?

1. (A) Green and blue
2. (B) Green and red
3. (C) Red and blue ✓
4. (D) Only green

4. Where do the dark reactions of photosynthesis occur?

1. (A) Stroma of chloroplast ✓
2. (B) Thylakoids of chloroplast
3. (C) Outer membrane
4. (D) Cytoplasm

5. Which process in aerobic respiration produces the most ATP?

1. (A) Glycolysis
2. (B) Krebs cycle
3. (C) Electron transport chain ✓
4. (D) Fermentation

6. Bioenergetics is the study of how living organisms:

1. (A) acquire, convert, store and utilize energy ✓
2. (B) make proteins
3. (C) divide
4. (D) move

7. The special energy currency of the cell is:

1. (A) ATP ✓
2. (B) DNA
3. (C) glucose
4. (D) chlorophyll

8. ATP stands for:

1. (A) adenosine triphosphate ✓
2. (B) adenosine diphosphate
3. (C) adenosine monophosphate
4. (D) amino triphosphate

9. ATP has the subunits adenine, ribose and:

1. (A) three phosphate groups ✓
2. (B) two phosphate groups
3. (C) one phosphate group
4. (D) glucose

10. Who proposed in 1941 that ATP is the main energy-transfer molecule in the cell?

1. (A) Fritz Lipmann ✓
2. (B) Melvin Calvin
3. (C) Hans Krebs
4. (D) Emil Fischer

11. The breaking of one phosphate bond of ATP releases about:

1. (A) 7.3 kcal per mole ✓
2. (B) 36 kcal per mole
3. (C) 0.73 kcal per mole
4. (D) 73 kcal per mole

12. When the outer high-energy bond of ATP breaks, ATP becomes:

1. (A) ADP and Pi ✓
2. (B) AMP only
3. (C) adenine only
4. (D) glucose

13. Photosynthesis is the synthesis of glucose from:

1. (A) carbon dioxide and water ✓
2. (B) oxygen and water
3. (C) glucose and oxygen
4. (D) starch and protein

14. The by-product of photosynthesis is:

1. (A) oxygen ✓
2. (B) carbon dioxide
3. (C) ATP only
4. (D) starch

15. Which organisms prepare their food by photosynthesis?

1. (A) Plants, algae and some bacteria ✓
2. (B) Animals only
3. (C) Fungi only
4. (D) All viruses

16. Photosynthesis occurs in two phases called:

1. (A) light reactions and dark reactions ✓
2. (B) glycolysis and Krebs cycle
3. (C) prophase and metaphase
4. (D) catabolism and anabolism

17. During the light reaction, light energy is used to make high-energy molecules, which are:

1. (A) ATP and NADPH ✓
2. (B) ADP and NAD
3. (C) glucose and oxygen
4. (D) pyruvic acid and CO2

18. In the light reactions, oxygen is released when light breaks:

1. (A) the water molecule ✓
2. (B) the glucose molecule
3. (C) carbon dioxide
4. (D) chlorophyll

19. NADP is reduced to ____ in the light reactions.

1. (A) NADPH ✓
2. (B) NAD
3. (C) FADH2
4. (D) ATP

20. The dark reactions of photosynthesis are also known as the:

1. (A) Calvin cycle ✓
2. (B) Krebs cycle
3. (C) ATP cycle
4. (D) Fischer cycle