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In the electron transport chain,what occurs between the two membranes of mitochondria?


A) Glycolysis occurs in the membranes.
B) Protons are pumped into the space between the membranes.
C) Oxygen is transported across the membranes.
D) The membranes prevent the mitochondria from rupturing during osmosis without two membranes.
E) The Krebs cycle enzymes are found on the outer mitochondrial membrane.

F) C) and D)
G) D) and E)

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The Krebs cycle continues the breakdown of glucose and


A) provides intermediates for manufacturing fats and amino acids.
B) replicates DNA.
C) provides oxygen to cells.
D) manufactures carbohydrates.
E) All answers are correct.

F) D) and E)
G) C) and D)

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In plants,chloroplasts function as the site of cellular respiration.

A) True
B) False

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Energy can be extracted from proteins by cellular respiration.

A) True
B) False

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Alcoholic fermentation


A) is carried out by yeasts.
B) produces far less ATP than aerobic respiration.
C) produces ethanol.
D) produces carbon dioxide.
E) All answers are correct.

F) B) and C)
G) A) and B)

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Four ATP molecules are made in the second step in glycolysis.However,the net production of ATP is two because


A) two molecules of ATP are needed to "activate" glucose.
B) two molecules of ATP are used to move glucose into the chloroplast.
C) glycolysis is the final step of aerobic respiration.
D) ATP production cannot exceed NADH production.
E) glycolysis may occur without oxygen being present.

F) A) and D)
G) A) and B)

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Philodendron flowers pass electrons through a modified electron transport chain to generate heat.What is the source of these electrons?


A) water
B) oxygen
C) ATP
D) sunlight
E) NADH and FADH₂

F) A) and D)
G) B) and E)

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In eukaryotic cells,the electron transport chain occurs in the


A) lysosome.
B) nucleus.
C) cytoplasm.
D) ribosome.
E) mitochondrion.

F) A) and B)
G) A) and C)

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The three main biochemical pathways of cellular respiration are


A) glycolysis, photosystems, and carbon reactions.
B) carbon reactions, Krebs cycle, and light reactions.
C) Krebs cycle, carbon reactions, and electron transport chain.
D) glycolysis, Krebs cycle, and electron transport chain.
E) light reactions, carbon reactions, and electron transport chain.

F) C) and D)
G) A) and E)

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Muscle cells use lactic acid fermentation to


A) regenerate NAD⁺ so that glycolysis can continue in the absence of oxygen.
B) produce ATP in the presence of oxygen.
C) produce more ATP than in respiration.
D) allow an animal to survive for long periods of time in the absence of oxygen.
E) produce less CO₂.

F) A) and C)
G) C) and D)

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During cellular respiration,electrons are transferred to the electron carrier molecules


A) ATP and FADH₂.
B) NADH and FADH₂.
C) carbon dioxide.
D) NADH₂ and glucose.
E) acetyl CoA.

F) B) and C)
G) C) and D)

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