Which of the following sequences correctly represents the flow of electrons during photosynthesis?

A. H2O > NADPH > Calvin Cycle

B. NADPH > Chlorophyll > Calvin Cycle

C. NADPH > Electron transport chain > O2

D. NADPH > O2 > CO2

E. H20 > Photosystem 1 > Photosystem 2

Photosynthesis is a redox reaction. This means that H2O is _____ during the light reactions and CO2 is _____ during the Calvin cycle.

You are watching: After 3 pga is phosphorylated it is reduced by _____

A. Oxidized ... Reduced

B. Reduced ... Reduced

C. Consumed ... Consumed

D. Consumed ... Reduced

E. Reduced ... Oxidized

What is the basic role of CO2 in photosynthesis?

A. CO2 is fixed or incorporated into organic molecules.

B. CO2 is taken in by plants as a form of inverse respiration, in which carbon dioxide is “breathed in” and oxygen is “breathed out.”

C. CO2 is a source of electrons in the formation of organic molecules.

Which of the following is a product of the light reactions of photosynthesis?

A. Glyceraldehyde-3-phosphate

B. High-energy photons

C. Oxygen, ATP, and NADPH

D. NADP+ and RuBP

E. Water and CO2

Photosystem 1

Photosystem 2

Photosystem 1 & 2

Reduction of NADP+

Reduction of primary electron acceptor

Oxidation of electron transport chain between two photosystems

Reduction of electron transport chain between the two photosystems

Light absorption

Oxidation of water

Photosystem 1

Oxidization of water

Reduction of electron transport chain between the two photosystems


Reduction of NADP+

Oxidation of electron transport chain between two photosystems


Reduction of primary electron acceptor

Light absorption

Electron transport step l Energy input required

Water > P680+ P680 > Pq (plastoquinone) Pq > P700+ P700 > Fd (ferredoxin) Fd > NADP+

Electron transport step l Energy input required

Water > P680+ … no energy P680 > Pq (plastoquinone) … energy Pq > P700+ … no energy P700 > Fd (ferredoxin) ... energy Fd > NADP+ … no energy
P. – P.Site of H+ release P. Site of ATP synthesis B. H+ pumped across membrane B. – B. H+ diffuses across membrane

When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by _____.

A. Oxidizing glucose

B. Fixing carbon

C. Splitting water

D. Breaking down ATP

E. Removing them from NADPH

C4 plants occur more commonly in desert conditions because _____.

A. They store carbon by incorporating CO2 into organic acids that are later catabolized

B. They produce water as a product of their photosynthetic pathways

C. The stomata open at night and close in the day

D. They can fix carbon at the lower CO2 concentrations that develop when the stomata are closed

E. They produce carbon dioxide internally via photorespiration

Carbon fixation involves the addition of carbon dioxide to _____.

A. Rubisco

B. G3P



E. 3-PGA

How many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose?

A. 6

B. 2

C. 10

D. 4

E. 8

In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?

A. 1

B. 3

C. 2

D. 4

E. 5

Which term describes ATP production resulting from the capture of light energy by chlorophyll?

A. Substrate-level phosphorylation

B. Photophosphorylation

C. Dephosphorylation

D. Oxidative phosphorylation

True or false? The chemiosmotic hypothesis states that the synthesis of ATP generates a proton gradient that leads to electron flow through an electron transport chain.



According to the chemiosmotic hypothesis, what provides the energy that directly drives ATP synthesis?

A. Temperature gradient

B. Osmotic gradient

C. Electrons

D. Proton gradient

Which of the following particles can pass through the ATP synthase channel?



C. Inorganic phosphate

D. Protons

True or false? The region of ATP synthase that catalyzes the production of ATP from ADP and inorganic phosphate spans the chloroplast membrane.



Chloroplast membrane vesicles are equilibrated in a simple solution of pH 5. The solution is then adjusted to pH 8. Which of the following conclusions can be drawn from these experimental conditions?

A. ATP will be produced because the proton gradient favors proton movement through the ATP synthase channels.

B. ATP will not be produced because there is no ADP and inorganic phosphate in the solution.

C. The change in the solution"s pH results in a gradient across the chloroplast membranes such that there is a lower concentration of protons inside the vesicles and a higher concentration outside.

D. Protons will not diffuse toward the outside of the vesicles.

B. ATP will not be produced because there is no ADP and inorganic phosphate in the solution.


_____ has a longer wavelength than _____.

A. Yellow ... red

B. Red ... green

C. Violet ... blue

D. Green ... yellow

E. Blue ... green

B. Red ... green


The overall function of the Calvin cycle is _____.

A. Making sugar

B. Producing carbon dioxide

C. Capturing sunlight

D. Splitting water

E. Oxidizing glucose

A. Making sugar


In mechanism, photophosphorylation is most similar to

A. Reduction of NADP+.

B. Carbon fixation.

C. The Calvin cycle.

D. Oxidative phosphorylation in cellular respiration.

E. Substrate-level phosphorylation in glycolysis.

D. Oxidative phosphorylation in cellular respiration.


Which of these phosphorylates ADP to make ATP?

a. A

b. D

c. E

d. C

e. B

C. E


_____ releases energy that is used to pump hydrogen ions from the stroma into the thylakoid compartment.

A. E

B. C

C. B

D. D

E. A

C. B


_____ splits water into 1/2 O2, H+, and e- .

See more: How Far Is This Fringe From The Center Of The Pattern? ? Double Slit Interference

A. B

B. C

C. A

D. E

E. D

C. A


Energized electrons from ____ enter an electron transport chain and are then used to reduce NADP+.