Which of the Following is NOT True Considering the Regulation

Question

Which of the following is NOT true considering the regulation of photosynthesis?
A) Rubisco is activated by high pH.
B) Rubisco is activated by 2-carboxy-D-arabinitol-1-phosphate, which is synthesized in the dark.
C) Rubisco activase removes 2-carboxy-D-arabinitol-1-phosphate in the presence of light.
D) Several of the Calvin cycle enzymes respond to redox state.
E) Xylulose-1,5-phosphate inhibits Rubisco.

Accepted Answer

Rubisco is not activated by 2-carboxy-D-arabinitol-1-phosphate, but rather it is actively inhibited by it. Rubisco activase removes inhibitory molecules like 2-carboxy-D-arabinitol-1-phosphate and is critical for the regulation of Rubisco. The other statements are true regarding the regulation of photosynthesis.