Use the following figure and the compounds labeled A, B, C, D, and E to answer the following questions.

Figure 10.2
-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? Study Figure 10.2 to help you in determining the correct answer.
A) The CO₂ acceptor concentration would decrease when either the CO₂ or light are cut off.
B) The CO₂ acceptor concentration would increase when either the CO₂ or light are cut off.
C) The CO₂ acceptor concentration would increase when the CO₂ is cut off, but decrease when the light is cut off.
D) The CO₂ acceptor concentration would decrease when the CO₂ is cut off, but increase when the light is cut off.
E) The CO₂ acceptor concentration would stay the same regardless of the CO₂ or light.

Question

Use the following figure and the compounds labeled A, B, C, D, and E to answer the following questions.
  
Figure 10.2
-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? Study Figure 10.2 to help you in determining the correct answer.
A) The CO₂ acceptor concentration would decrease when either the CO₂ or light are cut off. 
B) The CO₂ acceptor concentration would increase when either the CO₂ or light are cut off. 
C) The CO₂ acceptor concentration would increase when the CO₂ is cut off, but decrease when the light is cut off. 
D) The CO₂ acceptor concentration would decrease when the CO₂ is cut off, but increase when the light is cut off. 
E) The CO₂ acceptor concentration would stay the same regardless of the CO₂ or light.

Quizplus · Accepted Answer

The CO₂ acceptor concentration would increase when the CO₂ is cut off, but decrease when the light is cut off.When CO₂ is cut off, the Calvin cycle cannot proceed beyond the first step, so the CO₂ acceptor concentration will increase. When light is cut off, the Calvin cycle cannot proceed at all, so the CO₂ acceptor concentration will decrease.

Use the Following Figure and the Compounds Labeled A, B