Photosynthesis Energy Conversion 2

Question 1

What is the primary role of the antenna complex in the light-harvesting stage of photosynthesis?

Accepted Answer

To absorb photons and funnel energy to the reaction center

Answer

To split water molecules

Answer

To synthesize ATP directly

Answer

To reduce NADP+ to NADPH

Question 2

During the light-dependent reactions, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

NADP+

Answer

ADP

Answer

Oxygen

Answer

CO2

Question 3

How does cyclic electron flow differ from non-cyclic electron flow in terms of products?

Accepted Answer

Cyclic produces only ATP; non-cyclic produces both ATP and NADPH

Answer

Cyclic produces O2; non-cyclic does not

Answer

Cyclic produces only NADPH; non-cyclic produces both ATP and NADPH

Answer

Cyclic produces glucose; non-cyclic produces ATP

Question 4

What is the approximate energy (in eV) of a visible-light photon that drives Photosystem II?

Accepted Answer

1.8 eV

Answer

0.01 eV

Answer

100 eV

Answer

1000 eV

Question 5

Which process directly uses the proton gradient across the thylakoid membrane to synthesize ATP?

Accepted Answer

Chemiosmosis through ATP synthase

Answer

Substrate-level phosphorylation

Answer

Photophosphorylation via ferredoxin

Answer

Oxidative decarboxylation

Question 6

When a chlorophyll molecule absorbs a photon, what immediately happens to one of its electrons?

Accepted Answer

It is excited to a higher energy state

Answer

It is destroyed and replaced

Answer

It drops to a lower energy orbital

Answer

It splits a water molecule

Question 7

Which wavelengths of light are most efficiently absorbed by chlorophyll a for driving photosynthesis?

Accepted Answer

Red (~680 nm) and blue-violet (~430 nm)

Answer

Green and yellow

Answer

Infrared and ultraviolet

Answer

Orange and cyan