Photosynthesis/Cellular Respiration

In cellular respiration, the most energy is transferred during

• lactic acid fermentation.

• krebs cycle

• the electron transport chain

Which of the following is the best explanation for the presence of both chloroplasts and mitochondria in plant cells?

• Sugars are produced in chloroplasts. These sugars can be stored in the plant for later use, converted to other chemicals, or broken down in aerobic respiration to yield ATP for the plant to use to meet its energy needs.

• In the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs.

• The leaves and sometimes the stems of plants contain chloroplasts, which produce ATP to meet the energy needs of these plant parts. The roots of plants contain mitochondria, which produce ATP to meet the energy needs of these plant parts.

When living cells break down molecules, energy is

• stored as ATP.

• released as heat.

• Both stored as ATP and released as heat.

Water is an end product in

• fermentation.

• the electron transport chain.

• lactic acid formation.

Which of the following is not part of cellular respiration?

• glycolysis

• the Calvin cycle

• electron transport

Glycolysis and aerobic respiration are different in that

• glycolysis occurs in the absence of oxygen, while aerobic respiration requires oxygen.

• glycolysis occurs on the cell membrane, while aerobic respiration occurs in mitochondria.

• glycolysis occurs only in photosynthesis, while aerobic respiration is part of cellular respiration.

Acetyl coenzyme A

• is formed from the breakdown of pyruvic acid.

• enters the Krebs cycle.

• can be used in synthesis of needed molecules.

• all of these

In cellular respiration, a two-carbon molecule combines with a four-carbon molecule to form citric acid as part of

• glycolysis.

• the Krebs cycle.

• carbon fixation.

Cellular respiration takes place in two stages:

• glycolysis, then aerobic respiration.

• glycolysis and fermentation.

• aerobic respiration, then glycolysis.

When muscles are exercised extensively in the absence of sufficient oxygen,

• a large amount of ATP is formed.

• NADH molecules split.

• lactic acid is produced.