BioInteractive Photosystems I and II 2

Question 1

Which protein immediately accepts electrons from Photosystem I before NADPH is produced?

Accepted Answer

Ferredoxin

Answer

Plastocyanin

Answer

Pheophytin

Answer

Plastoquinone

Question 2

What reduced molecule is produced when NADP+ accepts electrons in Photosystem I?

Accepted Answer

NADPH

Answer

ATP

Answer

Oxygen

Answer

Water

Question 3

Which mobile electron carrier transfers electrons from Photosystem II to the cytochrome b6f complex?

Accepted Answer

Plastoquinone

Answer

Ferredoxin

Answer

NADPH

Answer

Plastocyanin

Question 4

Which copper-containing protein transfers electrons from the cytochrome b6f complex to Photosystem I?

Accepted Answer

Plastocyanin

Answer

Plastoquinone

Answer

Ferredoxin

Answer

NADPH

Question 5

How many water molecules must be split by the oxygen-evolving complex to release one molecule of O2?

Accepted Answer

Two

Answer

One

Answer

Four

Answer

Three

Question 6

What mechanism drives ATP synthesis by ATP synthase during the light reactions?

Accepted Answer

Proton gradient across the thylakoid membrane (chemiosmosis)

Answer

Oxygen release from water splitting

Answer

NADPH production by ferredoxin

Answer

Direct electron transfer to ferredoxin

Question 7

What are the three main products/byproducts of the complete non-cyclic electron flow pathway?

Accepted Answer

ATP, NADPH, and O2

Answer

CO2, glucose, and water

Answer

O2, glucose, and ATP

Answer

NADPH, glucose, and CO2