Q. No.Pyruvate dehydrogenase activity during aerobic respiration requires:
1.
Calcium
2.
Iron
3.
Cobalt
4.
Magnesium
The enzyme lactate dehydrogenase catalyses:
1. the oxidation of pyruvate to lactate to regenerate NAD+.
2. the reduction of pyruvate to lactate to regenerate NAD+.
3. the reduction of pyruvate to lactate to regenerate NADH.
4. the oxidation of pyruvate to lactate to regenerate NADH.
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In the citric acid cycle:
| 1. | oxygen is used to oxidise the acetyl group carbons of acetyl-CoA in the citric acid cycle. |
| 2. | three molecules of NADH and one molecule of FADH2 are produced in one turn. |
| 3. | oxygen is not used, so the cycle can occur in anaerobic conditions. |
| 4. | water is formed during the complete oxidation of glucose. |
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For aerobic cellular respiration, identify the correctly matched row:
|
Phase |
Cost,per glucose |
Gain,per glucose |
|
|
1. |
Glycolysis |
2 ATP |
4 ATP, 1 NADH |
|
2. |
Oxidation of pyruvic acid |
4 ATP |
2 NADH |
|
3. |
Krebs cycle |
2 ATP |
2 ATP, 6 NADH, 1 FADH2 |
|
4. |
Electron transport |
2 ATP |
34 ATP |
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How many molecules of ATP are directly synthesized in the glycolysis pathway from one glucose molecule?
| 1. | 2 | 2. | 4 |
| 3. | 6 | 4. | 10 |
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In the citric acid cycle, a molecule of GTP is formed during the conversion of:
1. - ketoglutarate to Succinyl-CoA
2. Succinyl-CoA to succinate
3. Succinate to fumarate
4. Fumarate to malate
With respect to the steps of glycolysis at which utilization or synthesis of ATP or NADH takes place, Identify the incorrect match:
|
1. |
Production of ATP |
BPGA to 3-PGA |
|
2. |
Utilization of ATP |
Fructose-6-phosphate to Fructose-1,6-biphosphate |
|
3. |
Production of NADH |
PGAL to BPGA |
|
4. |
Utilization of NADH |
3-PGA to 2-PGA |
Identify the correct statements regarding the mitochondrial electron transport system.
I. Electrons from NADH in mitochondrial matrix are first transferred to [Fe-S] and then to FMN in complex I
II. Complex II is not a proton pump
III. Cytochrome c is located on the outer surface of the inner membrane
IV. Ubiquinone, located within the inner mitochondrial membrane, is oxidized with the transfer of electrons to cytochrome c via complex III.
| 1. | Only II and III | 2. | Only II, III and IV |
| 3. | Only IV | 4. | Only I and III |
When oxygen is not available to a cell, NADH formed during glycolysis:
| 1. | does not undergo any change as there is no need for the cell to regenerate NAD+ |
| 2. | passes electrons to the electron transport system |
| 3. | passes hydrogen atoms to pyruvic acid |
| 4. | passes electrons and hydrogen atoms to acetyl coA |
Based on the figures given below, calculate the efficiency of the process of aerobic cellular respiration in a eukaryotic cell:
I. The total yield is 32 ATP molecules
II. Complete oxidation of a mole of glucose releases 686 kcal or energy under standard conditions.
III. Phosphorylation of ADP to form ATP stores at least 7.3 kcal per mole of ATP
| 1. | 3.5 % | 2. | 32 % |
| 3. | 34 % | 4. | 51 % |
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