AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What does carbon dioxide combine with to (eventually) form glucose?
A
NADPH
B
ATP
C
RuBP
D
G3P
Explanation: 

Detailed explanation-1: -An enzyme, RuBisCO, catalyzes the fixation reaction, by combining CO2 with RuBP.

Detailed explanation-2: -During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.

Detailed explanation-3: -RuBP stands for ribulose bisphosphate, it’s a 5 carbon compound involved in the Calvin cycle, which is part of the light-independent reactions of photosynthesis. Atmospheric CO2 is combined with RuBP to form a 6 carbon compound, with the help of an enzyme (biological catalyst) called RuBisCo.

Detailed explanation-4: -In the Calvin-Benson cycle, RuBP is a product of the phosphorylation of ribulose-5-phosphate (produced by glyceraldehyde 3-phosphate) by ATP.

Detailed explanation-5: -RuBP, which stands for ribulose bisphosphate, is a 5-carbon molecule that is involved in the Calvin cycle, which is one of the photosynthesis’s light-independent processes. With the aid of an enzyme called RuBisCO, atmospheric carbon dioxide is coupled with RuBP to generate a 6 carbon molecule.

There is 1 question to complete.