Q. No.Which among the following is the universal hydrogen acceptor during glycolysis and Krebs cycle before electrons enter the electron transport chain?
1. CoA
2. FAD
3. NAD⁺
4. ATP
1. CoA
2. FAD
3. NAD⁺
4. ATP
Subtopic: Glycolysis | Aerobic Respiration |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Aerobic Respiration:
| 1. | More common in higher organisms |
| 2. | Leads to complete oxidation of Organic substance in the presence of oxygen and release of Carbon-dioxide |
| 3. | Large amount of energy present in substrate and amount of water is also released out |
| 4. | All of these |
Subtopic: Aerobic Respiration |
97%
Level 1: 80%+
Hints
The link between glycolysis and Krebs cycle is the conversion of pyruvate to ______ in mitochondria.
| 1. | Acetyl-CoA | 2. | Citrate |
| 3. | Succinate | 4. | Malate |
Subtopic: Aerobic Respiration |
96%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Identify the incorrect statement:
| 1. | The Krebs cycle occurs in the mitochondrial matrix. |
| 2. | Each pyruvate molecule enters the Krebs cycle directly without any modification |
| 3. | The Krebs cycle produces CO2, NADH, and FADH2. |
| 4. | The Krebs cycle is also known as the citric acid cycle. |
Subtopic: Aerobic Respiration |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Pyruvate dehydrogenase activity during aerobic respiration requires :-
| 1. | Calcium | 2. | Iron |
| 3. | Cobalt | 4. | Magnesium |
Subtopic: Aerobic Respiration |
92%
Level 1: 80%+
Hints
Which enzyme is responsible for oxidative decarboxylation of pyruvate to acetyl-CoA in the mitochondrial matrix?
| 1. | Pyruvate dehydrogenase complex |
| 2. | Pyruvate carboxylase |
| 3. | Citrate synthase |
| 4. | Malate dehydrogenase |
Subtopic: Aerobic Respiration |
92%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which enzyme is required for the following conversion ?
\(\small {Pyruvic ~acid + \mathrm{CoA}+\mathrm{NAD}^{+} \longrightarrow \\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Acetyl ~\mathrm{CoA}+\mathrm{CO}_2+\mathrm{NADH}+\mathrm{H}^{+}}\)
1. Pyruvate dehydrogenase
2. Phosphoglucomutase
3. Pyruvate oxidase
4. Pyruvate carboxylase
\(\small {Pyruvic ~acid + \mathrm{CoA}+\mathrm{NAD}^{+} \longrightarrow \\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Acetyl ~\mathrm{CoA}+\mathrm{CO}_2+\mathrm{NADH}+\mathrm{H}^{+}}\)
1. Pyruvate dehydrogenase
2. Phosphoglucomutase
3. Pyruvate oxidase
4. Pyruvate carboxylase
Subtopic: Aerobic Respiration |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Who elucidated Krebs’ cycle for the very first time?
| 1. | Frederick Kreb | 2. | Hans Kreb |
| 3. | Edward Kreb | 4. | Tilman Kreb |
Subtopic: Aerobic Respiration |
91%
Level 1: 80%+
Hints
The first step of decarboxylation in cellular respiration is
| 1. | Conversion of PGAL to DHAP |
| 2. | Conversion of PGAL to PGA |
| 3. | Conversion of Pyruvate to Acetyl CoA |
| 4. | Conversion of BPGA to PGA |
Subtopic: Aerobic Respiration |
88%
Level 1: 80%+
Hints
The oxidative decarboxylation of pyruvate to acetyl-CoA is a critical link between glycolysis and the Krebs cycle. Which of the following coenzymes is essential for this reaction?
1. NADP+
2. FAD
3. Coenzyme A (CoA)
4. Biotin
1. NADP+
2. FAD
3. Coenzyme A (CoA)
4. Biotin
Subtopic: Aerobic Respiration |
88%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
© 2026 GoodEd Technologies Pvt. Ltd.