6

Question 1

what happens before the citric acid cycle can happen?

Answer 1

The pyruvate after glycolysis is oxidized to an acetyl group. One of the 3 carbons is released as CO2 and CoA is used to carry this to the citric acid cycle

Question 2

What does the citric acid cycle end up with (6)

Answer 2

• 2 CO2
• 3 NADH
• 1 FADH2
• 1 ATP
• 3 H+
• 1 CoA

Question 3

when burned in oxygen, methane becomes..

Answer 3

oxidized

Question 4

what happens during the initial steps of cellular respiration

Answer 4

glucose is broken down into pyruvate, releasing energy to from ATP

Question 5

How does glycolysis temorarily shuttle electrons for energy transfer?

Answer 5

the electron carrier molecule NAD+ accepts the electrons

Question 6

what happens during pyruvate oxidation

Answer 6

pyruvate is broken down into CO2 and acetyl-CoA

Question 7

What molecules are required to complete the pyruvate oxidation reaction

Answer 7

both CoA and NAD+

Question 8

Where are the high energy electrons remleased in citric acid cycle transferred

Answer 8

the mitochondrial electron system

Question 9

What type f fuel molecules provides electrons for the oxidative pathways of the citric acid cycle

Answer 9

CO2

Question 10

What is the function of the mitchondrial electron transfer system

Answer 10

to build the H+ ion gradient across the inner mitochondrial membrane

Question 11

In the mitochondrial electron transfer system, what molecule provides the energy to build the H+ gradient?

Answer 11

NADH and FADH2

Question 12

Chemiosmosis is a process in which ATP is

Answer 12

formed when protons move down the concentration gradient from the mitochondrial membrane to the matrix

Question 13

What happens where there are too many ATP molecules in the cytosol during glycolsis

Answer 13

excess ATP binds to the phosphofruktokinase enzyme, which blocks the enzyme action and inhibits glycolysis