General
✓✗Which compound acts as a common link for the breakdown of carbohydrates and fats and for the synthesis of fatty acids?
- acetyl CoA
- glucose-6-phosphate
- glycerol
- lactic acid
General
✓✗The F0 part of ATP synthase is
- a peripheral protein facing the matrix
- the catalytic site of ATP synthesis
- located in the outer membrane
- the proton channel across the inner membrane
General
✓✗In animal muscle cells during vigorous exercise, pyruvic acid is reduced to
- ethanol
- lactic acid
- citric acid
- acetyl CoA
General
✓✗A seed releases 7 mL of CO2 while consuming 10 mL of O2. Its RQ is
- 0.7
- 1.0
- 1.4
- 7
General
✓✗Which of the following statements correctly compares chemiosmosis in mitochondria and chloroplasts?
- Protons accumulate in the matrix in mitochondria and in the stroma in chloroplasts.
- Protons are not used in mitochondria.
- Protons accumulate in the cytoplasm in both.
- Protons accumulate in the intermembrane space in mitochondria and in the thylakoid lumen in chloroplasts.
General
✓✗The formation of acetyl CoA from pyruvic acid is a/an
- reduction
- dehydration
- oxidative decarboxylation
- phosphorylation
General
✓✗Match List I (substrate or condition) with List II (RQ).
| List I | List II |
| P. Glucose (aerobic) | 1. About 0.9 |
| Q. Tripalmitin | 2. Infinity |
| R. Protein | 3. 1.0 |
| S. Alcoholic fermentation | 4. About 0.7 |
- P-1, Q-4, R-3, S-2
- P-3, Q-4, R-1, S-2
- P-3, Q-1, R-4, S-2
- P-4, Q-3, R-1, S-2
General
✓✗A sample releases 9 mL of CO2 and uses 10 mL of O2. The substrate is most likely
- fat
- protein
- organic acid
- carbohydrate
General
✓✗In the equation 2(C51H98O6) + 145O2 → 102CO2 + 98H2O + energy, the number of O2 molecules needed per molecule of tripalmitin is
- 51
- 72.5
- 102
- 145
General
✓✗Why is NAD+ regeneration essential for fermenting cells?
- NAD+ fixes CO2 into sugars in yeast.
- NAD+ is the final acceptor of the ETS.
- Glycolysis needs NAD+ to oxidise PGAL.
- NAD+ is turned directly into ethanol.
General
✓✗Which statement about fermentation is correct?
- It occurs only in the cells of green plants.
- It requires the Krebs cycle and the ETS.
- It produces 38 ATP per molecule of glucose.
- It releases less than 7% of the energy in glucose.
General
✓✗NCERT notes that pure proteins or fats are never used as respiratory substrates. Which of the following follows from this?
- Fats can never be respired by any cell.
- Measured RQ values lie between substrate values.
- Proteins can never be respired by cells.
- Measured RQ values are always exactly 1.
General
✓✗The two main events of aerobic respiration, after glycolysis, are
- transpiration through stomata and guttation through hydathodes
- fermentation of pyruvate and glycolysis of glucose in the cytoplasm
- oxidation of pyruvate in the TCA cycle, and the ETS with ATP synthesis
- photolysis of water and fixation of carbon dioxide in the stroma
General
✓✗Cytochrome c is a small protein attached to the
- outer surface of the inner membrane
- mitochondrial DNA in the matrix
- outer membrane, facing the cytoplasm
- matrix side of the outer membrane
General
✓✗In fermentation, NADH + H+ is
- reoxidised to NAD+
- converted to NADPH
- stored in the vacuole
- used to make ATP in the ETS