principles of bio

14. The Krebs cycle produces
A) NADH and carbon dioxide.
B) water and carbon dioxide.
C) ADP and NADP++.
D) acetyl CoA and sugars.

15. During exercise, the increase in respiration rate and heartbeat speed are driven by the need for
A) oxygen in fermentation.
B) carbon dioxide in human lungs.
C) oxygen in muscle cell mitochondria.
D) oxygen in dark reactions.

16. The inner membrane of a mitochondrion is highly folded. Which of the following explains why this is the case?
A) The folds protect the proteins in the inner membrane from the toxic by-products of cellular respiration.
B) The folds increase the space available for electron transport chains, increasing the efficiency of ATP production.
C) The extra folds make the mitochondrion more efficient at capturing carbon dioxide.
D) The antenna complexes in the inner membrane form clusters that force the membrane into folds.