Chapter 7 Cellular Respiration

If the formation of 38 molecules of ATP requires 266 kcal of energy and the complete oxidation of glucose yields 686 kcal of energy, how efficient is cellular respiration at extracting energy from glucose?

• 20%

• 39%

• 25%

• 100%

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Electrons are donated to the electron transport chain by

• ATP and NADH

• FADH2 and NADH

• ATP and NAD+

• NAD+ and ATP

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In cellular respiration, the most energy is transferred during

• glycolysis

• lactic acid fermentation

• the Krebs cycle

• the electron transport chain

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When living cells break down molecules, energy is

• stored as ADP

• stored as ATP

• released as heat

• both b anc c

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Cellular respiration starts in the cytoplasm and end in the

• cytoplasm

• mitochondria

• endoplasmic recticulum

• lysosome

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At the end of the electron transport chain,

• all the electrons combine with oxygen and protons to form water

• the electrons are used in the formation of ethyl alcohol

• the electrons build up inside the mitochondria and diffuse back to a thylakoid

• none of the above

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What is a biochemical pathway of cellular respiration that is anaerobic?

• lactic acid

• mitochondria

• Glycolysis

• Krebs Cycle

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In the absence of oxygen, glycolysis is followed by ____________________ instead of aerobic respiration.

• fermentation

• glycolysis

• Krebs Cycle

• Calvin Cycle

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During fermentation, either ethyl alcohol and carbon dioxide or ______________________________ is formed.

• oxygen

• lactic acid

• hydrogen

• protons

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When cells break down food molecules, energy

• is released all at once

• is released entirely as body heat into the einvironment

• is temporarily stored in ATP molecules

• All of the above

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