Question 1

Paper 2Easy5 marks

During a simplified accounting of the Calvin cycle in a leaf, six molecules of triose phosphate are produced. One molecule leaves as net product; the remainder is used to regenerate RuBP.

(a)

Determine the number and fraction of the triose phosphate molecules used to regenerate RuBP.

[2]
(b)

State the number of RuBP molecules regenerated from these five triose phosphate molecules.

[1]
(c)

Explain the role of ATP in RuBP regeneration and why regenerated RuBP is needed for the Calvin cycle to continue.

[2]

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