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Exam 11: Phototrophic Energy Metabolism: Photosynthesis

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Question 31

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All of the following are true regarding anoxygenic photosynthesis except

A) a water molecule is split.
B) sulfide or thiosulfate can act as electron donors.
C) absorbed light energy is typically in the near ultraviolet and far red ranges of the light spectrum.
D) NADPH is regenerated by photoreduction.
E) it is a light-driven oxidation-reduction process.

F) A) and B)
G) B) and E)

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Question 32

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The transfer of energy from a photoexcited electron to another electron of an adjacent pigment molecule is known as

A) photoexcitation.
B) quantum leap.
C) photophosphorylation.
D) resonance energy transfer.
E) photorespiration.

F) B) and E)
G) A) and E)

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Question 33

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Which of the following products cannot be used in the Calvin cycle?

Rubisco is an important enzyme in the Calvin cycle.It catalyzes the addition of carbon dioxide and water to ribulose-1,5-bisphosphate,which then forms two molecules of 3-phosphoglycerate.Rubisco acts as a carboxylase and is essential for carbon fixation. a. Rubisco has an additional function.It can also function as an oxygenase.Why is this a problem for plants? b. Rubisco has a much lower affinity for oxygen than for carbon dioxide.Why is the oxygenase activity still a problem for plants? c. What is (are)the product(s)of the reaction when rubisco acts as an oxygenase? d. How does the plant deal with the product of the oxygenase reaction? e. The oxygenase activity of rubisco is particularly a problem for plants in arid environments.Can you explain why? f. What strategies do plants in arid environments use to deal with this problem?

The Calvin cycle occurs in the ________ region of the chloroplast.

Plastoquinol transfers electrons from

What is the advantage to having various types of chlorophylls and accessory pigments for the photosynthetic process?

The Calvin cycle in C₃ plants occurs in ________ cells,whereas the Calvin cycle in C₄ plants occurs in the ________.

The plants referred to as C₃ and C₄ plants get this designation based on the number of carbons in the first detectable product of carbon dioxide fixation.The C₃ product is ________,whereas the C₄ product is ________.

A house plant seems to be growing slowly and lacks its normal bright green color.You call a botanist for advice.She suggests that the plant may be deficient in magnesium (Mg²⁺) .Why are these symptoms associated with Mg²⁺ deficiency?

________ (CAM)plants open their stomata only at night to minimize water loss.

The glycolate pathway is also called ________,because CO₂ is released and oxygen is consumed in a light-dependent manner.

Bacteriochlorophyll differs from chlorophyll a and b in structure and function.Which of the following statements correctly contrasts these types of chlorophyll?

Based upon the comparisons of anoxygenic and oxygenic photosythesis,the entry of oxygen into the atmosphere is most directly attributed to

Which of the following initially traps solar energy in the process of photosynthesis?

If you needed to design an herbicide that was effective against a variety of different plants,what would you propose as a method to target individually CAM plants,C₄ plants,or a general herbicide?

Which of the following minerals are directly involved with light absorption in photosynthesis?

Match the term on the left with its definition or description on the right.

3-phosphoglycerate is to C₃ plants as ________ is to C₄ plants.

Which of the following statements is correct regarding cyclic photosynthetic pathways?