Biology Chapter 8

Chlorophylls absorb most light in which colors of the visible range?

• blue and red

• green and red

• violet and red

• green and blue

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

• reducing NADP+

• The electron transfer system of photosystem

• splitting water molecules

• chemiosmosis

which of the following statements best describes the relationship between photosynthesis and respiration?

• respiration runs the biochemical pathways of photosynthesis in reverse

• photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules

• ATP Molecules are produced in photosynthesis but not in aerobic respiration

• photosynthesis occurs only in plants; respiration occurs only in animals

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

• True

• False

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?

• FADH2

• NADH

• NADPH

• NAD+

What is the primary function of the Calvin cycle

• transporting RuBP

• using ATP to release carbon dioxide

• using NADPH to release carbon dioxide

• splitting water and releasing oxygen

• Synthesizing simple sugars from carbon dioxide

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

• true

• false

the process of photosythesis probably originated

• in prokaryotes

• in fungi

• in animals

• in plants

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what is the main purpose of light-dependent reactions of photosynthesis

• to generate oxygen by "splitting" O2

• to produce NADPH for use in respiration

• to produce NADPH and ATP

• to use ATP to make glucose

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

• fix CO2 into malic acids during the might

• fix the CO2 into sugars in the bundle-sheath cells

• fix CP2 into pyruvate in the mesophyll cells

• use the enzyme phosphofructokinase, which outcompetes rubisco for CO2

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