4.4.3 ATP Yield from Aerobic Respiration

Question 1

note

Answer 1

• The total ATP output of respiration from glycolysis through the electron transport chain is thirty-six ATP
• From glycolysis through the Krebs cycle, a total of four ATP,8 NADH, and 4 FADH2 were made.
• Note that in glycolysis the two NADH + H+ were converted to FADH2 before they were able to enter the electron transport chain.
• In general, for every two protons (H+) that pass through
  ATP synthase, one ATP is made. The electrons from NADH+ H+ lead to the pumping of six protons across the membrane while the electrons from FADH2
  lead to the pumping of four protons across the membrane.
• For each NADH + H+ that enters the electron transport chain, three ATP are made. Since FADH2 enters the electron transport chain later, each FADH2 that enters the chain leads to the production of two ATP. The estimated total production of ATP from aerobic respiration is about 36 ATP.

Question 2

How many ATP are produced during oxidative phosphorylation for each acetyl CoA that enters the Krebs cycle?

Answer 2

• 11

Question 3

Products of respiration include

Answer 3

• carbon dioxide and water

Question 4

The net ATP yield from one molecule of glucose from anaerobic respiration is

Answer 4

• 2

Question 5

The maximum ATP produced during the respiration of one molecule of glucose in a eukaryote is about

Answer 5

• 38

Question 6

For each NADH that enters the electron transport chain ___ ATP are produced. For each FADH2 that enters the electron transport chain ___ ATP are produced.

Answer 6

• 3; 2

Question 7

How many ATP are produced during the Krebs cycle for each glucose molecule that is broken down?

Answer 7

• 2

Question 8

The products of cellular respiration include all but which of the following?

Answer 8

• oxygen