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
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When an electron is shifted to a more electronegative atom, its potential energy:
| 1. | increases | 2. | decreases |
| 3. | remains same | 4. | can increase or decrease |
Consider the steps of glycolysis given in the diagram:
What is true about reaction 1?
I. Hexokinase is a transferase
II. It acts to keep the glucose concentration low
III. It blocks the glucose from leaking out
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
What process in aerobic respiration generates maximum ATP?
| 1. | substrate-level phosphorylation | 2. | chemiosmosis |
| 3. | Krebs cycle | 4. | Pyruvate decarboxylation |
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Consider the steps of glycolysis given in the diagram:
Regarding reaction 2 in the diagram:
| I: | Fructose can also enter the glycolytic pathway by phosphorylation at this point. |
| II: | Under conditions of high F6P concentration, this reaction readily runs in reverse. |
1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false
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 |
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is produced in
| 1. | glycolysis | 2. | the oxidation of pyruvate |
| 3. | the Krebs cycle | 4. | the electron transport chain |
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NADH is produced during
I. glycolysis
II. the oxidation of pyruvate
III. the Krebs cycle
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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Consider the steps of glycolysis given in the diagram:
It is advantageous that in reaction 5 DHAP is isomerized to G3P because:
1. G3P has more energy than DHAP
2. DHAP is highly toxic
3. Regulation of the pathway becomes easy
4. DHAP is unstable and breaks down to Acetyl CoA
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