Cellular Respiration

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Where does the Calvin cycle take place?

stroma of the chloroplast

When oxygen is released as a result of photosynthesis, it is a direct by-product of

splitting water molecules.

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

oxygen, ATP, and NADPH

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

splitting water

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from?

cyclic electron flow

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

the synthesis of ATP

In a plant cell, where are the ATP synthase complexes located?

thylakoid membrane and inner mitochondrial membrane

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic "knobs" of ATP synthase would be located

on the stromal side of the membrane.

Which of the following products of the light reactions of photosynthesis is consumed during the Calvin cycle?


Where do the enzymatic reactions of the Calvin cycle take place?

stroma of the chloroplast

The NADPH required for the Calvin cycle comes from

reactions initiated in photosystem I.

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, i, and NADP+ to the light reactions.

The phylogenetic distribution of the enzyme rubisco is limited to

all known photoautotrophs, both bacterial and eukaryotic.

Plants photosynthesize only in the light. Plants respire

both in light and dark.

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

release of oxygen

What is the basic role of CO2 in photosynthesis?

CO2 is fixed or incorporated into organic molecules.

Plants are photoautotrophs. What does this mean?

They use light energy to drive the synthesis of organic molecules from inorganic materials.

Photorespiration occurs when rubisco reacts RuBP with


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

They use PEP carboxylase to initially fix CO2.

Compared to C3 plants, C4 plants

can continue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations.

Plants photosynthesize only in the light. Plants respire

both in light and dark.

The light reactions of photosynthesis supply the Calvin cycle with


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

H2O→ NADPH→ Calvin cycle

Which process is most directly driven by light energy?

removal of electrons from chlorophyll molecules

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