Question

If the carbon atom of the incoming CO2 molecule is labeled with a radioactive isotope of carbon, where will the radioactivity be measurable after one cycle?

Answer 1

The calvin cycle is called the C3 cycle because the 3-carbon molecule is the first stable product of photosynthesis

Explanation:

The Calvin cycle reactions can be divided into  3 main stages namely the

1. carbon fixation
2. carbon reduction
3. carbon regeneration

if the carbon atom of the incoming CO2 molecule is labeled with a radioactive isotope of carbon,the radioactivity will be measurable at the 3rd stage ,the regeneration of CO2 acceptor(RuBP)

Answer 2

Radioactivity will only be measurable at the third (3rd) stage of the Calvin cycle i.e Ribulose bisphosphate (RuBP).

What is a Calvin cycle?

Calvin cycle can be defined as the light-independent reactions through which green plants (autotrophs) and algae to turn carbon dioxide ($CO_2$) obtained from the air into sugar, so as to provide food for their growths.

The Calvin cycle occurs in three (3) main stages and these include the following:

• Carbon fixation

• Carbon reduction

• Carbon regeneration

Generally, when the carbon atom of an incoming carbon dioxide ($CO_2$) molecule is labeled with a radioactive isotope of carbon, radioactivity will only be measurable at the third stage of the Calvin cycle as shown in the image below, which is the regeneration of carbon dioxide ($CO_2$) as acceptor i.e Ribulose bisphosphate (RuBP).

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