Krebs (citric acid) cycle and oxidative phosphorylation

Question 1

How many molecules of acetyl CoA are produced from a single molecule of glucose for participation in the Krebs cycle?

Answer 1

2

Question 2

How are electrons extracted from the citric acid cycle for use in the electron transport chain?

Answer 2

Reduction of NAD+ and FAD

Question 3

A molecule is said to be reduced when it

Answer 3

Undergoes the addition of electrons or decrease in oxidation state

Question 4

The citric acid cycle produces

Answer 4

FADH2 and NADH

Question 5

Large concentrations of what would inhibit the entry of pyruvate into the citric acid cycle?

Answer 5

NADH

Question 6

What are essential reactants for the formation of acetyl CoA?

Answer 6

Coenzyme A and pyruvate

Question 7

What are products of the conversion of pyruvate into acetyl CoA?

Answer 7

• ATP
• NADH
• Acetyl CoA

Question 8

ATP synthase is located in

Answer 8

Inner mitochondrial membrane

Question 9

How many ATP are produced per molecule of NADH?

Answer 9

3

Question 10

How many ATP are produced per molecule of FADH2?

Answer 10

2

Question 11

The major product of the electron transport chain and oxidative phosphorylation is

Answer 11

ATP

Question 12

What increase the activity of the electron transport chain and oxidative phosphorylation?

Answer 12

High [ADP]

Question 13

The pH of the cytosol ranges around

Answer 13

7

Question 14

Reactive oxygen species are common causes of

Answer 14

• Apoptosis

- Cellular damage

Question 15

Superoxide dismutase is an enzyme which functions to

Answer 15

Neutralize oxygen radicals

Question 16

The approximate total yield of ATP that is produced via the Krebs cycle from a single molecule of acetyl CoA is

Answer 16

10 ATP