Calvin Cycle

Question 1

What is the first step of the calvin cycle?

Answer 1

CO2 enters the leaf and diffuses into the stroma
CO2 combines with RuBP and forms a 6C
Rubisco catalyses the reaction between CO2 and RuBP
6C breaks into glycerate 3-phosphate

Question 2

What is the second step in the calvin cycle?

Answer 2

ATP provides energy to turn GP into TP
H+ needed from NADPH
TP then converted into hexose compounds

Question 3

What is the final step in the calvin cycle?

Answer 3

5/6 TP are used to regenerate RuBP

This uses the remaining ATP molecules

Question 4

How are carbohydrates made from TP and GP?

Answer 4

Hexose sugars are made by joining 2 TP molecules

Larger carbs made by joining hexose sugars

Question 5

How are lipids made from TP and GP?

Answer 5

Glycerol synthesised from TP

Fatty acids synthesised from GP

Question 6

How are proteins made from TP and GP?

Answer 6

Amino acids made from GP

Question 7

Why does the calvin cycle have to turn six times?

Answer 7

3 turns produces 6 molecules of TP - 2 TP made/CO2
5/6 TP used to regenerate RuBP
3 turns of cycle, 1 TP used to make hexose
6 turns are needed to produce 2 TP to form a hexose
18ATP 12NADPH from light-dependent reaction

Question 8

Where does the calvin cycle take place?

Answer 8

In the stroma