AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The third stage in the Calvin Cycle is:
A
Regeneration
B
Carbon Fixation
C
Reduction
Explanation: 

Detailed explanation-1: -Regeneration. It is the third stage of the Calvin cycle and is a complex process that requires ATP. In this stage, some of the G3P molecules are used to produce glucose, while others are recycled to regenerate the RuBP acceptor.

Detailed explanation-2: -The Calvin cycle have three stages. Ribulose-1, 5 bisphosphate is regenerated from glyceraldehyde-3-phosphate in the third stage, which is known as the regeneration stage.

Detailed explanation-3: -In the last stage of the Calvin Cycle, RuBP is regenerated, which enables the system to prepare for more CO2 to be fixed.

Detailed explanation-4: -The immediate products of one turn of the Calvin cycle are 2 glyceraldehyde-3-phosphate (G3P) molecules, 3 ADP, and 2 NADP+. (ADP and NADP+ are not really “products". They are regenerated and later used again in the light-dependent reactions).

Detailed explanation-5: -Creating G3P is the ultimate objective of the Calvin cycle. In step three, some of the G3P molecules are used to create sugar. Glucose, the type of sugar produced by photosynthesis, is composed of two G3P molecules.

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