Answer key

question 1 (worth 2 points)

alcoholic fermentation

forms fewer atp molecules than cellular respiration

uses oxygen and atp molecules as reactants

occurs in the muscle cells of animals and humans

gives off carbon dioxide and nadh as products

points earned on this question: 0

question 2 (worth 2 points)

what substances are used up as the reactants in cellular respiration?

o2 and h2o

o2 and c6h12o6

co2 and c6h12o6

co2 and h2o

points earned on this question: 2

question 3 (worth 2 points)

what process must happen before this process depicted below?

two pyruvate molecules are converted to two lactic acid molecules. two nadh molecules are converted to two nad+ molecules in the process.

fermentation

cellular respiration

krebs cycle

glycolysis

points earned on this question: 0

question 4 (worth 2 points)

in the krebs cycle,

pyruvate is broken down into co2 molecules

glucose is broken down into nadh and co2

co2 is converted into pyruvate and o2

nadh and co2 are converted into atp

points earned on this question: 2

question 5 (worth 2 points)

during the process of cellular respiration, energy stored in glucose molecules is used to form

oxygen molecules

nad+

atp

carbohydrates

points earned on this question: 2

question 6 (worth 2 points)

where does the krebs cycle occur?

cytoplasm

mitochondrion

cell membrane

nucleus

points earned on this question: 2

question 7 (worth 2 points)

what stage of cellular respiration produces pyruvate as a product?

glycolysis

electron transport chain

krebs cycle

fermentation

points earned on this question: 2

question 8 (worth 2 points)

what stage of cellular respiration does not involve any carbon-based compounds as a reactant or product?

electron transport chain

krebs cycle

glycolysis

fermentation

points earned on this question: 2

question 9 (worth 2 points)

what is produced from the third stage of cellular respiration, the electron transport chain?

nadh and water

water and atp

pyruvate and atp

carbon dioxide and nadh

points earned on this question: 2

question 10 (worth 2 points)

what stage of respiration immediately follows the process depicted below?

two pyruvate molecules undergo a chemical reaction, combining with coenzyme a to form two acetyl-coa molecules. two carbon dioxide molecules and two nadh molecules are formed as a result of this process.

electron transport chain

glycolysis

fermentation

krebs cycle

points earned on this question: 2