Glycolysis will be most adversely affected by a toxin:
1. that reacts with oxygen and reduces its availability
2. that binds to pyruvate and inactivates it
3. that closely mimics the structure of glucose but is not metabolized
4. that regenerates ${\mathrm{NAD}}^{+}$ from NADH

Consider the latter half of glycolytic pathway given below:

In reaction 6
I. The enzyme involved is an oxidoreductase
II. Arsenate may uncouple the pathway at this stage
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 latter half of glycolytic pathway given below:

Regarding reaction 7:
I. Glycolysis has reached the break-even point.
II. When the cell has plenty of ATP (and little ADP), this reaction does not occur.
1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false

Refer to the schematic diagram of Krebs citric acid cycle given below:

How many of the enzymes involved in the pathway are dehydrogenases?
  
1. 2
2. 3
3. 4
4. 5

Refer to the given schematic diagram of Krebs cycle :

The step where substrate level phosphorylation takes place is catalyzed by the enzyme:
1. Aconitase
2. Isocitrate dehydrogenase
3. Succinyl-CoA synthetase
4. Succinate dehydrogenase

When pyruvic acid is converted to acetyl CoA, the former is:

A five carbon amino acid can be formed by which of the following intermediates of Krebs cycle?

The number of molecules of carbon dioxide produced by three turns of the Krebs cycle would be:

What is the total number of NADH and ${\mathrm{FADH}}_2$ molecules produced for each molecule of glucose metabolized by glycolysis and the citric acid cycle?

The correct sequence of electron flow during aerobic respiration would be:
1. food → Krebs cycle → ATP → NAD⁺
2. food → NADH → electron transport chain → oxygen
3. glucose → pyruvate → ATP → oxygen
4. glucose → ATP → electron transport chain → NADH