Light-independent reaction

Definition

Light-independent reactions, also known as the Calvin cycle, occur in the stroma of chloroplasts where ATP and NADPH from light-dependent reactions are used to produce glucose. These reactions do not require light directly but rely on the products of light-dependent reactions.

5 Must Know Facts For Your Next Test

1. Occurs in the stroma of chloroplasts.
2. Utilizes ATP and NADPH produced during light-dependent reactions.
3. Produces glucose and other carbohydrates.
4. Involves three main phases: carbon fixation, reduction phase, and regeneration of RuBP.
5. Key enzyme involved is ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO).

Review Questions

• Where do light-independent reactions take place?
• What are the three main phases of the Calvin cycle?
• Which enzyme is crucial for carbon fixation in the Calvin cycle?

Related terms

Light-dependent Reactions: Reactions that occur in the thylakoid membranes and require light to produce ATP and NADPH.

Stroma:

Fluid-filled space surrounding the thylakoids in chloroplasts where light-independent reactions occur.

RuBisCO:

An enzyme that catalyzes the first step of carbon fixation in the Calvin cycle.