The following statements describe stages in the Calvin Cycle (carbon fixation) - Scottish Highers Biology - Question 8 - 2018
Question 8
The following statements describe stages in the Calvin Cycle (carbon fixation).
1 Carbon dioxide attaches to ribulose bisphosphate (RuBP) producing 3-phosphoglycer... show full transcript
Worked Solution & Example Answer:The following statements describe stages in the Calvin Cycle (carbon fixation) - Scottish Highers Biology - Question 8 - 2018
Step 1
Catalysed by RuBisCO
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Answer
The stage that is catalysed by RuBisCO is step 1, where carbon dioxide attaches to ribulose bisphosphate (RuBP) to produce 3-phosphoglycerate (3PG). RuBisCO is the enzyme responsible for this crucial first step in the Calvin Cycle.
Step 2
Requires hydrogen
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Answer
The stage that requires hydrogen is step 2, where 3-phosphoglycerate (3PG) is converted into glyceraldehyde-3-phosphate (G3P). This stage involves the reduction process that requires NADPH, which carries hydrogen atoms necessary for the conversion.
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