Photosynthesis: Calvin Cycle/LIR

Question 1

Location

Answer 1

Stroma of the chlorophyll

Question 2

Step 1 - Carbon fixation

Answer 2

• CO2 diffuse in through stomata
• CO2 reacts with RuBP producing an unstable 6C compound which splits into 2 forming 3C GP molecules

Question 3

Step 2 - reduction of GP

Answer 3

• energy from ATP and NADPH produced during the LDR are used to reduce GP to 2 molecules of a phosphorylated 3C sugar TP
• 1/6 of TP molecules are used to produce organic molecules e.g. condense to become hexose to produce starch/cellulose
• 6 ATP becomes 6ADP, 6 NADPH becomes 6 NADP+

Question 4

Regeneration of RuBP

Answer 4

5/6 of TP molecules are used to regenerate RuBP this requires ATP
- 3 ATP converted to 3 ADP

Question 5

Intermediates

Answer 5

TP: triose phosphate - produces other molecules

GP: glycerate-3-phosphate - produces some amino acids