Quiz on Krebs Cycle or TCA Cycle or Tricarboxylic acid Cycle

Kreb cycle is the second step in plant respiration. It occurs in the mitochondrial matrix. In honour of Krebs, cyclic chemical changes occurring in the matrix of the mitochondrion together are called Krebs cycle. First organic acid formed during Krebs cycle is citric acid. Hence Krebs cycle is also called citric acid cycle. It is also known as tricarboxylic acid (TCA) as citric acid. Read more>>

1. In a eukaryotic cell, most of the enzymes of the citric acid cycle are located in the
inner mitochondrial membrane.
mitochondrial matrix
outer mitochondrial membrane
cytosol

2. Most of the ATP made during cellular respiration is generated by
glycolysis
photophosphorylation
oxidative phosphorylation
substrate-level phosphorylation

3. Pyruvate, the end product of glycolysis, enters the citric acid cycle after it has been converted to
acetaldehyde
acetyl CoA
lactic acid
acetic acid

4. The FADH2 and NADH produced by the oxidation of one acetyl-CoA result in the synthesis of about --- ATPs.
10
11
15
20

5. Reducing equivalents produced by catabolism in the mitochondrion are transported to the cytosol for biosynthesis
as FADH2
as NADPH
indirectly as malate
indirectly as succinate

6. Energy that is released from glucose during respiration but not transferred to ATP bonds can be detected as
H2O
heat
CO2
ADP

7. In contrast to resting cells, muscle tissue in a highly active metabolic state will have .... ATP/ADP and ..... NADH/NAD+.
medium; medium
high; low
low; high
high; high

8. Which of the following reactions is not a control point in the citric acid cycle?
Isocitrate dehydrogenase
a-Ketoglutarate dehydrogenase
Malate dehydrogenase
Pyruvate dehydrogenase

9. The following reactions in the citric acid cycle are all reversible except
Citrate synthase
Fumarase
Succinic dehydrogenase
Succinyl-CoA synthetase

10. Pyruvic acid can be converted, in one enzyme-catalyzed step, to all of the following compounds except
Acetyl-CoA
Oxaloacetate
Lactate
Serine

Score =
Correct answers:

0 comments:

Post a Comment