Answered: Refer to the figure. To identify the…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 4TYK

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Question

Refer to the figure. To identify the molecule that accepts CO₂, Calvin and Benson manipulated the carbon fixation cycle by either cutting off CO₂ or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO₂ acceptor?

a) The CO₂ acceptor concentration would decrease when either the CO₂ or light is cut off.

b)The CO₂ acceptor concentration would decrease when the CO₂ is cut off but increase when the light is cut off.

c)The CO₂ acceptor concentration would stay the same regardless of the CO₂ or light.

d)The CO₂ acceptor concentration would increase when either the CO₂ or light is cut off.

e)The CO₂ acceptor concentration would increase when the CO₂ is cut off but decrease when the light is cut off.

3
ATP
3 ADP
E
3 P
Ribulose bisphosphate
(RuBP)
Phase 3:
Regeneration of
the CO₂ acceptor
(RuBP)
G3P
с
Input
A 30 (Entering one
CO₂ at a time)
Rubisco
Short-lived
intermediate
Calvin
Cycle
Phase 1: Carbon fixation
G3P
(a sugar)
Output
DOP
3-Phosphoglycerate
6
1,3-Bisphosphoglycerate
Glyceraldehyde-3-phosphate
(G3P)
Glucose and
other organic
compounds
6 ADP
B
-6P,
6 NADP+
6 NADPH
ATP
Phase 2:
Reduction

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