lecture 9

Question 1

the calvin cycle

Answer 1

• builds sugar from smaller molecules using ATP and the reducing power of electrons in NADPH
• anabolic process
• CO2 (carbon) enters and leaves as G3P (glyceraldehyde-3-phosphate)

Question 2

Carbon fixation

Answer 2

• CO2 attatched to 5-C sugar RuBP (ribulose biphosphate)
• catalysed by RuBP carboxylase (rubisco)
• 6-C product immediately breaks to 2 three-C products
• 3-C compound formed first (C3 photosynthesis)

Question 3

Reduction

Answer 3

• 3-C molecule phosphorylated then reduced forming G3P sugar
• phosphorylated (ATP –> ADP)
• reduced (NADPH –> NADP+)

Question 4

Regeneration of CO2 aceptor

Answer 4

• 5 molecules of G3P rearranged to 3 molecules RuBP

Question 5

costing

Answer 5

• 9 ATP
• 6 NADPH

Question 6

tracking atoms

Answer 6

• light rxns split water
• electrons into sugar molecule
• oxygen released