Photosynthesis APB

The oxygen released by photosynthesis is produced by which of the following processes?

• splitting water molecules

• chemiosmosis

• the electron transfer system of photosystem I

• the electron transfer system of photosystem II

Why are the reaction centers of photosystems composed of several structurally different pigments?

• Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain.

• This arrangement enables the plant to absorb light energy of a variety of wavelengths.

• This arrangement enables the plant to absorb more photons from light energy, all of which are at the same wavelength.

• This arrangement enables the reaction center to excite electrons to a higher energy level.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers?

• It excites electrons of the reaction center in photosystem I.

• It is used to synthesize ATP through substrate-level phosphorylation.

• It is used to establish and maintain a proton gradient.

• It is used to phosphorylate NAD+ to NADPH.

Tags

NGSS.HS-LS1-5

Why are C4 plants able to photosynthesize with no apparent photorespiration?

• They do not participate in the Calvin cycle.

• They conserve water more efficiently.

• They exclude oxygen from their tissues.

• They use PEP carboxylase to initially fix CO2.

Which of the following statements summarizes the metabolic results of photorespiration?

• It produces carbon dioxide and consumes ATP and oxygen.

• It produces ATP and consumes oxygen and carbon dioxide.

• It produces oxygen and consumes ATP and carbon dioxide.

• It produces oxygen and ATP and consumes carbon dioxide.

Tags

NGSS.HS-LS2-3

Which of the following does not occur during the Calvin cycle?

• carbon fixation

• oxidation of NADPH

• release of oxygen

• regeneration of the CO2 acceptor