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Worksheets

TCA

Total questions: 24

Worksheet time: 12mins

Name
Class
Date
1.

The "fuel" for the Kreb's cycle is

a)

CO2

b)

H2O

c)

GTP

d)

Acetyl-CoA

2.

These are formed during the cycle which carries electrons and hydrogen ions to the Electron Transport Chain.

a)

CO2 and H2O

b)

NAD+ and FAD

c)

NADH and FADH2

d)

GTP and CO2

3.

How many carbon atoms are in pyruvate?

a)

2

b)

3

c)

5

d)

4

4.

How many FADH2 are formed during two turn of the Krebs cycle?

a)

2

b)

4

c)

6

d)

0

5.

How many carbon atoms are in Acetyl-CoA?

a)

1

b)

2

c)

4

d)

6

6.

NAD+ is the _________ form and NADH is the ___________ form

a)

oxidized / reduced

b)

reduced / oxidized

7.

FAD forming into FADH2 is a type of what reaction?

a)

Oxidation

b)

Reduction

c)

Hydration

d)

Decarboxylation

8.

The chemical reactions of the Citric Acid Cycle take place in

a)

Inner mitochondrial membrane

b)

Outer mitochondrial membrane

c)

Mitochondrial matrix

d)

Intermembrane space of mitochondria

9.

The starting point of the Kreb's Cycle

a)

Acetyl CoA + Citrate

b)

Oxaloacetate + Acetyl CoA

c)

Acetyl CoA + Isocitrate

d)

Acetyl CoA + CO2

10.

The products of a single turn of Citric Acid Cycle.

a)

(1) CO2, (3) NADH, (1) FADH2, (1) ATP

b)

(2) CO2, (1) NADH, (3) FADH2, (1) ATP

c)

(4) CO2, (3) NADH, (1) FADH2, (1) ATP

d)

(2) CO2, (3) NADH, (1) FADH2, (1) ATP

11.
The "regenerator" of the Krebs Cycle is:
a)
Oxaloacetate
b)
Acetyl-CoA
c)
Citrate
d)
α-Ketoglutarate
12.
Before entering Krebs Cycle, pyruvate is:
a)
Oxidized
b)
Reduced
c)
Isomerized to Acetyl-CoA
d)
Phosphorylated
13.
The number of ATP molecules produced out of Krebs Cycle is:
a)
2
b)
3
c)
4
d)
0
14.
How many FADH2 molecules are produced by 1 molecule of glucose?
a)
1
b)
2
c)
3
d)
4
15.
How many FADH2 molecules are produced by 1 turn of the Krebs Cycle?
a)
1
b)
2
c)
3
d)
4
16.
How many NADH molecules are produced by a molecule of glucose through the Krebs' Cycle?
a)
2
b)
3
c)
4
d)
6
17.
Which of the following is not a requirement for the Krebs Cycle?
a)
NAD+
b)
FAD+
c)
Water
d)
Pyruvate
18.
How many CO2 molecules are produced by the Krebs Cycle for a molecule of glucose?
a)
2
b)
4
c)
6
d)
3
19.
Krebs Cycle takes place in the:
a)
Cytoplasm
b)
Matrix
c)
Ribsome
d)
InterMembrane Space
20.
Folds in the mitochondrion are called:
a)
Cristae
b)
Matrix
c)
Golgi Bodies
d)
Carbuncles
21.
The inner most interior of the mitochondrion is called the:
a)
Cristae
b)
Matrix
c)
Golgi Bodies
d)
Carbuncles
22.
Krebs Cycle is part of_______________ respiration.
a)
Aerobic
b)
Anaerobic
23.
Prior to entering the Krebs Cycle, each pyruvate molecule loses electrons, hydrogen ions, and a carbon, forming an energy-rich molecule of
a)
Acetyl-CoA
b)
Citrate
c)
Oxaloacetate
d)
Malate
24.
After the Krebs Cycle only a small portion of the energy of glucose has been converted to ATP. At this point the majority of usable energy is contained in
a)
NADH and FADH2
b)
Carbon Dioxide 
c)
Acetyl-CoA
d)
Citrate

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