Homework Chapter 5

Question 1

Which of the following molecules act(s) as an immediate source of energy for cellular work?

ATP
carbohydrates
lipids
lipids and ATP
lipids and carbohydrates

Answer 1

ATP

Question 2

Which of the following represents the flow of energy during electron transport and ATP synthesis?

The breakdown of two acetyl-CoA drives the production of 2 ATP, 6 NADH, and 2 FADH2.
The breakdown of glucose to pyruvate produces 2 NADH and 2 ATP.
The breakdown of pyruvate to acetyl-CoA fuels the production of 2 NADH.
The removal of electrons from NADH and FADH2 is used to fuel the production of large amounts of ATP.

Answer 2

The removal of electrons from NADH and FADH2 is used to fuel the production of large amounts of ATP.

Question 3

What is the impact of oxygen depletion on a cell carrying out aerobic respiration?

The proton gradient steepens.
NAD+ levels decrease due to the inability of NADH to donate electrons to the ETC.
NAD+ levels increase in order to increase the rate of carbohydrate catabolism.
ATP generation speeds up to compensate for the loss of NADH.

Answer 3

NAD+ levels decrease due to the inability of NADH to donate electrons to the ETC.

Question 4

Fermentation is a direct source of ATP for a fermentative cell.

False
True

Answer 4

False

Question 5

How does a competitive inhibitor slow enzyme catalysis?

They compete with the substrate for the enzyme’s active site.
They produce products toxic to the enzymes.
They degrade the substrate.
They bind to the substrate.

Answer 5

They compete with the substrate for the enzyme’s active site.