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Q. No.Consider the given statements:
Statement I:
In alcohol fermentation in yeast, pyruvic acid decarboxylase and alcohol dehydrogenase convert pyruvic acid to carbon dioxide and ethanol.
Statement II:
In lactic acid fermentation, lactate dehydrogenase reduces pyruvic acid to lactic acid and carbon dioxide in muscle cells during exercise.
1.
Both Statement I and Statement II are correct
2.
Both Statement I and Statement II are incorrect
3.
Statement I is correct but Statement II is incorrect
4.
Statement I is incorrect but Statement II is correct
Subtopic: Fermentation |
56%
Level 3: 35%-60%
Hints
After the two molecules of pyruvate, produced at the end of glycolysis from one molecule of glucose, enter the mitochondrial matrix and till the Krebs cycle is complete, which of the following will not be a correct number of the corresponding molecule produced?
| 1. | Eight molecules of NADH + H+ |
| 2. | Two molecules of FADH2 |
| 3. | Two molecules of ATP |
| 4. | Four molecules of carbon dioxide |
Subtopic: Aerobic Respiration |
61%
Level 2: 60%+
Hints
Identify the incorrectly matched pair:
| Respiratory Complex | Pathway for electron transport | |
| 1. | NADH dehydrogenase | NADH – FMN – [Fe-S] – Q |
| 2. | Succinic dehydrogenase | FADH2 – FMN - Q |
| 3. | Cytochrome bc1 | Cyt b – [Fe-S] – Cyt c1 |
| 4. | Cytochrome c oxidase | CuA – Cyt a – Cyt a3 – CuB |
Subtopic: ETS |
61%
Level 2: 60%+
Hints
Which of the following would be correct regarding the comparison of fermentation and aerobic respiration?
| Fermentation | Aerobic respiration | |
| I: | Partial breakdown of glucose | Complete breakdown of glucose |
| II: | Net gain of only two molecules of ATP beginning with one molecule of glucose | Net gain of many more molecules of ATP beginning with one molecule of glucose |
| III: | NADH is oxidised to NAD+ slowly | NADH is oxidised to NAD+ vigorously |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Fermentation | Aerobic Respiration |
67%
Level 2: 60%+
Hints
In glycolysis, NAD+ is reduced to NADH + H+:
| 1. | during conversion of 1,3 biphosphoglyceric acid to 3-phosphoglyceric acid |
| 2. | during conversion of glyceraldehyde -3-phosphate to 1,3 biphosphoglyceric acid |
| 3. | during conversion of glucose to glucose-6-phospate |
| 4. | during conversion of 3-phosphoglyceric acid to 2-phosphoglycerate |
Subtopic: Glycolysis |
80%
Level 1: 80%+
Hints
Subtopic: Glycolysis |
79%
Level 2: 60%+
Hints
In glycolysis, ATP is synthesised:
| 1. | during conversion of 1,3 biphosphoglyceric acid to 3-phosphoglyceric acid and during conversion of phosphoenolpuruvate to pyruvic acid |
| 2. | during conversion of glucose to glucose-6-phospate and during conversion of fructose-6-phosphate to fructose – 1,6- biphosphate |
| 3. | during conversion of glucose to glucose-6-phospate and during conversion of glucose-6-phosphate to fructose-6- phosphate |
| 4. | during conversion of 3-phosphoglyceric acid to 2-phosphoglycerate and during conversion of 2-phosphoglycerate to phosphoenolpuruvate |
Subtopic: Glycolysis |
83%
Level 1: 80%+
Hints
Consider the two statements:
| Statement I: | Inside a cell, the glucose molecule is oxidised not in one step but in several small steps. |
| Statement II: | Some steps will be just large enough such that energy liberated can be coupled to ATP synthesis. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Introduction |
59%
Level 3: 35%-60%
Hints
Cellular respiration includes:
| I: | Transport of gases from the respiratory surface to the cells |
| II: | Breakdown of food material within the cell to release energy |
| III: | Trapping of energy released during the breakdown of food material within the cell for synthesis of ATP |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Aerobic Respiration |
50%
Level 3: 35%-60%
Hints
Identify the incorrectly matched pair:
| Component of ETC | Name | |
| 1. | Complex I | NADH dehydrogenase |
| 2. | Complex II | Succinate dehydrogenase |
| 3. | Complex III | Cytochrome b6f complex |
| 4. | Complex IV | Cytochrome c oxidase |
Subtopic: ETS |
78%
Level 2: 60%+
Hints
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