CB16: Cellular Energy

Question 1

How are food molecules turned into energy (3 steps)?

Answer 1

1) Digestion of macromolecules to small subunits.
2) Simple subunits are converted to acetyl CoA.
3) Krebs/citric acid cycle produces ATP (amongst other products).

Question 2

How many ATP molecules are produced per glycolysis?

Answer 2

3

Question 3

How many ATP molecules are produced per glucose molecule during the Krebs cycle?

Answer 3

1 glucose molecule = 2 rounds of Krebs cycle
So 6 NADH, 2 GTP and 2 FADH2 produced.
Which equals to 15 + 2 + 3 = 20 ATP

Question 4

How is ATP produced?

Answer 4

Glycolysis, oxidative phosphorylation & citric acid cycle.

Question 5

How much ATP is usually produced in cellular respiration?

Answer 5

30-32 molecules

Question 6

What are the common activated carrier molecules that store energy temporarily ?

Answer 6

• ATP
• NADH
• NADPH
• FADH2
• Acetyl CoA
• Carboxylated biotin
• Uridine diphosphate glucose
• S-adenosylmethionine

Question 7

What is the function of the intermembrane space of the mitochondria?

Answer 7

Allows for H+ to accumulate for chemiosmosis and oxidative phosphorylation.

Question 8

What is the function of the double membrane of the mitochondrion?

Answer 8

It contains membrane transport proteins to transport pyruvate into the mitochondrion.

Question 9

What is the function of the inner membrane of the mitochondrion?

Answer 9

It contains the electron transport chain for oxidative phosphorylation.

Question 10

What is the function of the matrix of the mitochondrion?

Answer 10

It contains the right enzymes and the right pH for the Krebs cycle.

Question 11

What is the function of the cristae of the mitochondrion?

Answer 11

It’s highly folded to increase SA:vol ratio to increase rate of diffusion.