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Biology•Medium

Photosynthesis Pathway

Biology challenge: Photosynthesis converts light energy into chemical energy in two stages: the light reactions and the Calvin cycle.

Scenario

A plant cell is photosynthesizing. You need to trace the path of energy and atoms through the light reactions (thylakoid) and the Calvin cycle (stroma).

Scored questions

Question 1

Where do the light reactions occur in the chloroplast?

Question 2

What are the direct products of the light reactions (used in the Calvin cycle)?

Question 3

How many CO₂ molecules must be fixed to produce ONE molecule of glucose (C₆H₁₂O₆)?

Question 4

Which enzyme catalyzes carbon fixation in the Calvin cycle?

Answer keys, scoring tolerance, XP, and awards stay on the server. Retrying the same attempt cannot award twice.

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