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Photosynthesis and Light Reactions

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Questions and Answers

What is the role of light energy in the light reactions?

To catalyze the splitting of water molecules

To reduce Fe-S proteins

To synthesize NADPH

To generate ATP and NADPH (correct)

What is the purpose of the oxygen evolving complex in the light reactions?

To synthesize ATP

To generate NADPH

To catalyze the splitting of water molecules (correct)

To reduce PSI

What is the result of the proton gradient in the light reactions?

Generation of NADPH

Reduction of PSI

Synthesis of ATP (correct)

Oxidation of PSII

What is the role of PSI and PSII in the Z-scheme?

To boost electrons to the energy level needed to produce NADPH (D) Signup and view all the answers

What is the purpose of cyclic electron flow?

To synthesize ATP without making NADPH (D) Signup and view all the answers

What is the main difference between non-cyclic and cyclic photophosphorylation?

The type of photosystems involved (A) Signup and view all the answers

What are the byproducts of the light reactions?

NADPH, ATP, O2, Water (A) Signup and view all the answers

What is the primary role of the electron transport chain in the light reactions?

To produce ATP (D) Signup and view all the answers

What is the fate of the electrons in the light reactions?

They are used to generate an electrochemical gradient (A) Signup and view all the answers

What is the primary mechanism of energy coupling in the light reactions?

Chemiosmosis (D) Signup and view all the answers

What is the role of NADPH in the light reactions?

To reduce carbon dioxide (B) Signup and view all the answers

What is the product of the light reactions that is used in the Calvin cycle?

NADPH (D) Signup and view all the answers

What is the primary function of carotenoids in the light reactions?

To prevent oxidative damage of chlorophyll during photosynthesis (C) Signup and view all the answers

What is the difference between chlorophyll a and chlorophyll b?

Chlorophyll a has a CH3 group, while chlorophyll b has an aldehyde group (-CHO) (C) Signup and view all the answers

What is the fate of energy absorbed by pigments in the light reactions?

It has three possible fates: converting to heat or light, transferring to a neighbouring molecule, or transferring to an electron acceptor (B) Signup and view all the answers

What is the role of chlorophyll a in the light reactions?

It is the primary photosynthetic pigment that absorbs light energy and powers photosynthesis (B) Signup and view all the answers

What is the purpose of resonance energy transfer in the light reactions?

To transfer energy from a neighbouring molecule to chlorophyll a (A) Signup and view all the answers

What is the outcome of charge separation in the light reactions?

The transfer of an electron to an electron acceptor (B) Signup and view all the answers