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Chapter 10 quiz questions


If photosynthesizing green algae are providd with CO2 synthesized with heavy oxygen (18O), later analysis will show that all but one of the following compounds produced by the algae contain the 18O label. That one is


Which of the following are products of the light reactions of phorosynthesis that are utilized in the Calvin cycle?

stroma of the chloroplast

Where does the Calvin cycle take place?


In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?

along the inner surface of the plasma membrane

In autotrophic bacteria, where are the enzymes located that can carry on organic synthesis?

splitting the water molecules

When oxygen is released as a result of photosynthesis, it is a by-product of which of the following?

lowest wavelength

What wavelength of light in the figure is MOST effective in driving photosynthesis

harvest photons and transfer light energy to the reaction-center chlorophyll

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

this pigment is best at absorbing light with a wavelength of 700 nm

The reaction-center chlorophyll of photosynthesis 1 is known as P700 because

The electron vacencies in P680 are filled by electrons derived from water

Which statement describes the functioning of photosystem II?

to test for liberation of O2 in the light

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be


What are the products of linear photophosphorylation?

cyclic electron flow

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 come from?

The synthesis of ATP

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?

establishment of a proton gradient

What does the chemiosmotic process in chloroplasts involve?

The isolated chloroplasts would make ATP

Suppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to pH-8 solution. What would be likely to happen?

Thylakoid membrane and inner mitochondrial membrane

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

the stroma to the thylakoid space

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

both photosynthesis and respiration

Generation of proton gradients across membranes occurs during

They are inversely related

What is the relatinship between wavelength of light and the quantity of energy per photo?

The molecular environment lets it boost an electron to a higher energy level and also to transfer the electron to another molecule

In a protein complex for the light reaction (a reaction center), energy is transferred from pigment molecule to pigment molecule, to a special chlorophyll a molecule, and eventually to the primary electron acceptor. Why does this occur?

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

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

synthesize simple sugars from carbon dioxide

What is the primary function of the Calvin cycle?

light reactions alone

Produces molecular oxygen (O2)

the Calvin cycle alone

Requires ATP

neither the light reactions and the Calvin cycle

Produces NADH

light reactions alone

Produces NADPH

the Calvin cycle alone

Produces three-carbon sugars

the Calvin cycle alone

Requires CO2

Neither the light reactions nor the Calvin cycle

Requires glucose

regeneration of RuBP

In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to happen in the Calvin cycle?

The pH within the thylakoid is less than that of the stroma

The pH of the inner thylakoid space has been measured, as have the pH of the stroma and the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?

C4 plant

In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (14C) dioxide as a metabolic tracer. The 14C is incorporated first into oxaloacetate. The plant is best characterized as a

fix CO2 into organic acids during the night

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

3-phosphoglycerate molecules

Photorespiration lowers the efficiency of photosynthesis by preventing the formation of

H2O->NADPH->Calvin cycle

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

release of oxygen

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

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