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Exam 10: Photosynthesis

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Question 1

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What is the main purpose of the light-dependent reactions of photosynthesis?

A) to generate oxygen by "splitting" H₂O
B) to produce NADPH for use in respiration
C) to produce NADPH and ATP
D) to use ATP to make glucose

E) None of the above
F) B) and C)

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Question 2

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As electrons are passed through the system of electron carriers associated with photosystem II,they lose energy.What happens to this energy?

A) It excites electrons of the reaction center of photosystem I.
B) It is lost as heat.
C) It is used to establish and maintain a proton gradient.
D) It is used to phosphorylate NAD⁺ to NADPH,the molecule that accepts electrons from photosystem I.

E) A) and B)
F) A) and C)

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Question 3

Multiple Choice

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The final electron acceptor(s) associated with photosystem I is/are _____.

Which of the following statements most accurately compares photosynthesis and respiration?

Why are there several structurally different pigments in the reaction centers of photosystems?

Plastoquinone (PQ) ,an electron carrier of small molecular weight,is found in the electron transport chain associated with photosystem II.If PQ is not directly anchored to other membrane or cytoplasmic structures,it is probably _____.

Which of the following statements concerning chloroplasts is false?

Early investigators thought the oxygen produced by photosynthetic plants came from carbon dioxide.In fact,it comes from _____.

The absorption spectrum of a plant shows what wavelengths of light the plant absorbs.The absorption spectrum depends on _____.

Data suggest that rubisco (ribulose-1,5-bisphosphate carboxylase) makes up 10% of the total protein found in spinach leaves.Research elucidating the structure of rubisco shows that it has four active sites.Why,with four active sites,might there be such a large concentration of rubisco in plant matter?

The process of photosynthesis probably originated _____.

What event accompanies energy absorption by chlorophyll (or other pigment molecules of the antenna complex) ?

Purple photosynthetic bacteria do not contain chloroplasts.They have an antenna system that includes two light-harvesting protein complexes,both of which are integral membrane proteins.The bacteriochlorophyll a molecules contain Mg²⁺ and absorb light at 800 nm.Which of the following statements comparing photosynthesis in purple bacteria and plant chloroplasts is true?

In the carbon fixation step of the Calvin cycle,ribulose-1,5-bisphosphate (a five-carbon compound) is carboxylated to produce _____.

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?

Which of the following is a difference between chlorophyll a and chlorophyll b?

CAM plants function using crassulacean acid metabolism.Like C₄ plants,CAM plants provide a preparatory step for the Calvin cycle.CAM plants are found in hot,dry environments;to prevent desiccation,they keep their stomata closed during the day.They take in carbon dioxide at night while stomata are open.To increase the concentration of carbon dioxide available to the enzyme rubisco and minimize the degree of photorespiration,the CAM plants carboxylate _____.

Chlorophylls absorb light in which colors of the visible range?

The electrons of photosystem II are excited and transferred to electron carriers.From which molecule or structure do the photosystem II replacement electrons come?

If pigments from a particular species of plant are extracted and subjected to paper chromatography,which of the following is the most believable result?