Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 13, Problem 5Q
Summary Introduction
To review:
The role of the following during photosynthesis:
a. Plastocyanin
b. β-Carotene
c. Ferredoxin
d. Plastoquinone
e. Pheophytina
f. Lutein
Introduction:
Photosynthesis is the process of producing food in the form of sugar by green plants, cyanobacteri, and some Protists. It is a light-driven biochemical mechanism as it requiresenergy from sunlight to synthesize ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate) in the form of energy. In this proces, sarbon dioxide is incorporated into organic molecule, glucose. This process takes place inside the photosystems (membrane-bound protein complex in chloroplast) in plants.
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Students have asked these similar questions
What is the difference between the cyclic and noncyclic pathways of photosynthesis?
a
The cyclic pathway uses electron transport.
b
The cyclic pathway is light-dependent.
c
The noncyclic pathway produces NAPDH.
d
The noncyclic pathway produces ATP.
How are the NADPH and G3P molecules made during photosynthesis similar? a. They are both end products of photosynthesis. b. They are both substrates for photosynthesis. c. They are both produced from carbon dioxide. d. They both store energy in chemical bonds.
Ribulose bisphosphate carboxylase, which might be the most abundant enzyme on Earth, is part of which photosynthetic reaction?
A. the Hill reaction
B. the light-independent reaction
C. photosystem II
D. the light-dependent reaction
E. photosystem I
Chapter 13 Solutions
Biochemistry: The Molecular Basis of Life
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- Select the best answer describing the role of light in photosynthesis a.It is the source of respiration b.It is the source of carbon for the reaction c.It is the source of energy for the reaction d. all of thesearrow_forwardUnder what conditions do the wasteful side reaction of O2 with rubisco become significant? a.) at night when the sun goes down and photosynthesis is limitng b.) low temperatures and high moisture c.) higher levels of soluable CO2 than O2 d.) higher levels of soluable O2 than CO2 e.) higher levels of rubisco enzyme in the cytoplasmarrow_forwardUsing the graph comparing photosynthetic rate and absorption of different wavelengths of light, what can be concluded? a) The photosynthesis rate at 550 nm is the highest b) Chlorophyll a absorbs wavelengths at both ends of the spectrum c) Chlorophyll b is associated with the greatest rate of photosynthesis. d) Carotenoids absorb the narrowest range of wavelengths of lightarrow_forward
- The main purpose of the light-independent reactions is to ________. a. convert solar energy to chemical energy b. convert solar energy to ATP for short-term energy use c. build carbohydrates for long-term energy storagearrow_forwardExplain why each of the following misconceptions about photosynthesis is false: a. Only plants are autotrophs. b. Plants do not need cellular respiration because they carry out photosynthesis. c. Chlorophyll is the only plant pigment.arrow_forwardWhat would be the effect on production of ATP from photosynthesis, assuming no effect on enzyme/protein stability, if the pH of the chloroplast stroma were lowered? a) It would increase b) It would decrease c) It would stay the samearrow_forward
- Which of the following changes would decrease ATP production in the light-dependent reactions of photosynthesis? a. decreasing the pH of the thylakoid lumen b. decreasing the pH of the chloroplast stroma c. increasing the concentration of NADP+ in the chloroplast stroma d. making the thylakoid membrane freely permeable to protons by adding a proton channel e. two of the above would decrease ATP productionarrow_forwardWhen oxygen gas is released as a result of photosynthesis, it is a direct byproduct of what process? a. splitting of water molecules b. the electron transfer system in the photosystems c. chemiosmosis d. reducing of NADP+arrow_forwardIf an enzyme in the Calvin cycle were knocked out, then a the light-dependent reactions would increase. b the light-dependent reactions would stop. c the light-dependent reactions would diminish. d the light-dependent reactions would be unaffected.arrow_forward
- In the process of Photosynthesis food A is prepared which gets converted into food B. What are A and B? Why is A converted to B?arrow_forwardCarbon dioxide is required for which of the following processes in photosynthesis? a) the Calvin cycle b) the splitting of water c) the absorption of water d) the production of ATP e) the light reactionarrow_forwardIn photosynthesis, NADPH is the product of a. Photosystem II b. Photosystem I c. the manganese cluster enzyme complex d. P680arrow_forward
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