Cellular Respiration sample questions

Question: Which step of the cellular respiration pathway does NOT take place in the mitochondria?

Answer Options:
glycolysis
Krebs cycle
acetyl-CoA production
electron transport chain

Answer: glycolysis

Question: Which step of cellular respiration produces the MOST ATP molecules?

Answer Options:
acetyl-CoA production
electron transport chain
glycolysis
Krebs cycle

Answer: electron transport chain

Question: Each molecule of glucose results in _____ full rotation(s) of the Krebs cycle.

Answer Options:
three
one
four
two

Answer: two

Question: What is the purpose of co-enzymes NAD⁺/NADH and FAD/FADH₂ in cellular respiration?

Answer Options:
They serve to directly help catalyze the reaction of ADP to ATP
They serve as high-energy electron carriers
They serve to help produce co-enzyme A
They serve as the final electron acceptor for the electron transport chain

Answer: They serve as high-energy electron carriers

Question: What is the final electron acceptor for the electron transport chain?

Answer Options:
glucose
water
carbon dioxide gas
oxygen gas

Answer: oxygen gas

Question: What is the purpose of setting up a hydrogen ion (proton) gradient in the inner membrane space of the mitochondria during the electron transport chain?

Answer Options:
to allow for the formation of more NADH and FADH₂
to provide the energy needed for ATP synthase to make ATP
to allow for another round of the Krebs cycle
to be able to break down ATP molecules in the cell

Answer: to provide the energy needed for ATP synthase to make ATP

Question: During the electron transport chain, molecules of NADH can produce more ATP than molecules of FADH₂

Answer Options:
True
False

Answer: True

Question: Fermentation reactions generally occur under conditions of ______.

Answer Options:
high oxygen levels
low oxygen levels
low temperatures
low glucose levels
high glucose levels
high temperatures

Answer: low oxygen levels

Question: In animals, exertion without sufficient oxygen leads to the production of ______.

Answer Options:
glucose
lactic acid
ethanol
oxygen gas

Answer: lactic acid

Question: Glucose is the only molecule that cells can use to produce ATP.

Answer Options:
True
False

Answer: False