Q. No.
The stage of cellular respiration that directly involves oxygen is:
| 1. | glycolysis |
| 2. | at the end of ETC |
| 3. | Krebs cycle |
| 4. | the phosphorylation of ADP to form ATP |
1. substrate-level phosphorylation
2. chemiosmosis
3. Krebs cycle
4. Pyruvate decarboxylation
Consider the steps of glycolysis given in the diagram:
Regarding reaction 3 in the diagram:
| I: | The reaction is a key regulatory point and is also the rate-limiting step. |
| II: | The reaction is freely reversible. |
1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false
In aerobic respiration, oxygen acts as:
| I: | Terminal electron acceptor |
| II: | Terminal proton acceptor |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
is produced in
| 1. | glycolysis | 2. | the oxidation of pyruvate |
| 3. | the Krebs cycle | 4. | the electron transport chain |
Krebs cycle is also called as:
| 1. | glycolysis | 2. | fermentation |
| 3. | Calvin cycle | 4. | the citric acid cycle |
A five carbon amino acid can be formed by which of the following intermediates of Krebs cycle?
| 1. | succinate | 2. | malate |
| 3. | citrate | 4. | α-ketoglutarate |
The components of the mitochondrial electron transport chain are located:
1. in mitochondrial matrix
2. in outer mitochondrial membrane
3. in inner mitochondrial membrane
4. in intermembrane space
The correct sequence of flow of electrons downhill in the mitochondrial electron transport chain would be:
1. ubiquinone, cytochromes, FMN, Fe-S
2. cytochromes, FMN, ubiquinone, Fe-S
3. Fe-S, FMN, cytochromes, ubiquinone
4. FMN, Fe-S, ubiquinone, cytochromes
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