The number of substrate level of phosphorylations in one turn of citric acid cycle is:

1.	One	2.	Two
3.	Three	4.	Four

Pyruvate dehydrogenase activity during aerobic respiration requires :-

1. Calcium

2. Iron

3. Cobalt

4. Magnesium

Consider the two given statements:
I. Glycolysis is thought to be one of the most ancient of metabolic processes.
II. Glycolysis neither uses nor needs O2.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect

In aerobic cellular respiration, maximum number of ATP molecules is produced during?
1. Glycolysis
2. Oxidation of pyruvate
3. Kreb’s cycle
4. Chemiosmosis

The mitochondrial electron transport chain is located in:
1. The outer membrane
2. The inner membrane
3. The inter-membrane space
4. Stroma

The products of three turns of Kreb’s cycle will be:
1. 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂
2. 3 ATP, 3 CO₂, 3 NADH, and 3 FADH₂
3. 3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂
4. 38 ATP, 6 CO₂, 3 NADH, and 12 FADH₂

In β-oxidation:

Pyruvate enters the mitochondrion by:
1. Active transport
2. Facilitated diffusion
3. Diffusion
4. Through a channel

What percent of ATP produced during glycolysis are the result of substrate level phosphorylation?
1. 0
2. 25
3. 50
4. 100

In aerobic cellular respiration, oxygen is actually directly used only by:
1. Glycolysis
2. Oxidation of pyruvate
3. Kreb’s cycle
4. Electron transport