Question

atp synthesis and atp synthase
label the atp synthase on diagram 6
describe how the proton (h⁺) gradient is used to make atp
what two molecules bring chemical energy from the light reactions to the next stage of photosynthesis, the calvin cycle?
part 6: calvin cycle

1. label diagram 7 with the three phases of the calvin cycle.

diagram 7
briefly describe what is going on in each phase and answer the questions shown.
phase 1 (diagram 8)
description:
what enzyme catalyzes the reaction in this phase?

Explanation:

Step1: Identify key concepts

Photosynthesis has light - dependent and light - independent reactions. The light - dependent reactions produce ATP and NADPH.

Step2: Understand ATP synthesis

The proton gradient generated in the light - dependent reactions drives ATP synthesis via ATP - synthase.

Step3: Recall energy - carrying molecules

ATP and NADPH carry energy to the Calvin cycle.

Step4: Know Calvin cycle phases

The Calvin cycle has three phases: carbon fixation, reduction, and RuBP regeneration.

Step5: Identify carbon - fixation enzyme

Rubisco is the key enzyme in the carbon - fixation phase of the Calvin cycle.

Answer:

1. Label the ATP - synthase on Diagram 6: (No Diagram 6 shown, so cannot provide a specific label. But generally, ATP - synthase is a complex enzyme located in the thylakoid membrane (in chloroplasts for photosynthesis) or the inner mitochondrial membrane (in mitochondria for cellular respiration). It has a head - piece (F1) and a membrane - spanning portion (F0)).
2. Describe how the proton (H⁺) gradient is used to make ATP: Protons flow through the F0 portion of ATP - synthase from the thylakoid lumen (in chloroplasts) or the inter - membrane space (in mitochondria) to the stroma (in chloroplasts) or the mitochondrial matrix (in mitochondria) down their electrochemical gradient. This flow of protons causes a conformational change in the F1 portion of ATP - synthase, which catalyzes the addition of a phosphate group to ADP, forming ATP.
3. What two molecules bring chemical energy from the light reactions to the next stage of photosynthesis, the Calvin cycle? ATP and NADPH.
4. Label Diagram 7 with the three phases of the Calvin cycle: The three phases of the Calvin cycle are carbon fixation, reduction, and regeneration of RuBP. (Without seeing the actual diagram, it's assumed that the appropriate labels can be placed on the diagram to represent these phases).
5. Briefly describe what is going on in each phase and answer the questions shown (Phase 1 - Diagram 8):

• Description: In the carbon - fixation phase of the Calvin cycle, carbon dioxide (CO₂) combines with ribulose - 1,5 - bisphosphate (RuBP) to form 3 - phosphoglycerate (3 - PGA).
• What enzyme catalyzes the reaction in this phase? Rubisco (ribulose - 1,5 - bisphosphate carboxylase/oxygenase).