Biology: Quiz 8 (Photosynthesis)

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. . This energy is used to establish and maintain a proton gradient. True False

True

NAD+ and NADP : Both function as electron carriers, but NADP has a phosphate group and NAD+ does not. True False

True

The chemiosmotic process in chloroplasts involves the establishment of a proton gradient across the thylakoid membrane. True False

True

the primary function of the Calvin cycle: synthesizing simple sugars from carbon dioxide True False

True

Which of the following sequences correctly represents the flow of electrons during photosynthesis? A.) H2O → NADPH → Calvin cycle B.) NADPH → O2 → CO2 C.) NADPH → chlorophyll → Calvin cycle D.) H2O → photosystem I → photosystem II

A.) H2O → NADPH → Calvin cycle

Chlorophylls absorb most light in which colors of the visible range? A.) blue and red B.) green and blue C.) green and red D.) Violet and red

A.) blue and red

CAM plants keep stomata closed in the daytime, thus reducing water loss. They can do this because they ________. A.) fix CO2 into malic acids during the night B.) fix CO2 into sugars in the bundle-sheath cells C.) fix CO2 into pyruvate in the mesophyll cells D.) use the enzyme phosphofructokinase, which outcompetes rubisco for CO2

A.) fix CO2 into malic acids during the night

The process of photosynthesis probably originated ________. A.) in prokaryotes B.) plants C.) fungi D.) animals

A.) in prokaryotes

Where do the enzymatic reactions of the Calvin cycle take place? A.) stroma of the chloroplast B.) thylakoid membranes C.) matrix of the mitochondria D.) cytosol around the chloroplast

A.) stroma of the chloroplast

What event accompanies energy absorption by chlorophyll (or other pigment molecules of the antenna complex)? A.) ATP is synthesized from the energy absorbed. B.) An electron is excited from water. C.) A carboxylation reaction of the Calvin cycle occurs. D.) Electrons are stripped from NADPH.

B.) An electron is excited from water.

When oxygen is released as a result of photosynthesis, it is a direct by-product of ________. A.) the electron transfer system of photosystem I B.) splitting water molecules C.) chemiosmosis D.) reducing NADP+

B.) splitting water molecules

What is the primary function of the Calvin cycle? A.) splitting water and releasing oxygen B.) using ATP to release carbon dioxide C.) synthesizing simple sugars from carbon dioxide D.) using NADPH to release carbon dioxide E.) transporting RuBP out of the chloroplast

C. ) synthesizing simple sugars from carbon dioxide

The light-independent reactions of plants function to make organic molecules using carbon dioxide as a carbon source. What is the electron source that helps reduce carbon dioxide to sugars and other organic molecules? A.) FADH2 B.) NADH C.) NADPH D.) NAD+

C.) NADPH

In autumn, the leaves of deciduous trees change colors. This is because chlorophyll is degraded and ________. A.) water supply to the leaves has been reduced B.) sugars are sent to most of the cells of the leaves C.) carotenoids and other pigments are still present in the leaves D.) the degraded chlorophyll changes into many other colors

C.) carotenoids and other pigments are still present in the leaves

The process of photosynthesis probably originated ________. A.) in fungi B.) in animals C.) in prokaryotes D.) in plants

C.) in prokaryotes

What is the main purpose of light-dependent reactions of photosynthesis? A.) to generate oxygen by "splitting" O2 B.) to produce NADPH for use in respiration C.) to produce NADPH and ATP D.) to use ATP to make glucose

C.) to produce NADPH and ATP

Which of the following statements best describes the relationship between photosynthesis and respiration? A.) Respiration runs the biochemical pathways of photosynthesis in reverse. B.) ATP molecules are produced in photosynthesis but not in aerobic respiration. C.) Photosynthesis occurs only in plants; respiration occurs only in animals. D.) Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules

D.) Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules

Photosynthesis Reactions that require CO2 take place in ________. A.) neither the light reactions nor the Calvin cycle B.) the light reactions alone C.) both the light reactions and the Calvin cycle D.) the Calvin cycle alone

D.) the Calvin cycle alone

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle? A.) H2O and O2 B.) CO2 and glucose C.) ADP, Pi, and NADP+ D.) electrons and H+ E.) ATP and NADPH

E.) ATP and NADPH

the primary function of the Calvin cycle: using ATP to release carbon dioxide True False

False