Metabolic Processes Calvin Cycle - Pop Quiz 4

Question 1

What are the three stages of the Calvin cycle

Answer 1

Carbon fixation to Reduction to Reformation

Question 2

How many turns per CO2 of the Calvin cycle

Answer 2

Each CO2 (or carbon) allows 1 turn of the Calvin cycle

Question 3

How many turns are needed to produce 1 G3P to for glucose

Answer 3

3 turns for 1 G3P used for glucose

Question 4

What molecules are needed to produce 1 G3P

Answer 4

3CO2, 6 NADPH, and 9 ATP

Question 5

Who discovered the Calvin cycle

Answer 5

Melvin Calvin who won a Nobel prize

Question 6

What are the three carbohydrates the glucose from the Calvin cycle can become

Answer 6

Sucrose (transport), Starch (storage), and cellulose (cell walls)

Question 7

What is the full name of RuBP

Answer 7

Ribulose 1,5 - Bisphosphate (5 carbon molecule)

Question 8

What is the general reaction for Phase 1: Carbon fixation

Answer 8

3RuBP ——-3CO2 + 3H2O + (protein Rubisco)——-> 6 PGA (3-Phosphoglycerate)

Question 9

How is the number of carbons changing in Phase 1

Answer 9

3RuBP (total of 15 Carbons), over the equal sign (3 carbons from 3CO2) into 6 PGA (3 carbons per PGA, 18 carbon total)

Question 10

What is the full name of Rubisco

Answer 10

Ribulose Bisphosphate Carboxylase

Question 11

When PGA is created in phase 1, what is that specific process called and where does it usually occur

Answer 11

C3 Fixation which usually occurs in temperate regions (varying temps)

Question 12

How fast does Rubisco work

Answer 12

Works very slowly at 3 Substrate molecules/second compared to 1000 of usual enzymes

Question 13

Because of Rubisco being a slow working enzyme, what are the plants needs when it comes to Rubisco

Answer 13

Many copies of Rubisco are needed

Question 14

What is the PPP rule

Answer 14

Rubisco is the most Prevalent Protein on the Planet as it makes up more than 1/2 of all proteins in a leaf

Question 15

What is happening to PGA in the reduction phase

Answer 15

It is phosphorylated by 6 ATP to become 6 more reactive 1,3-Bisphosphoglycerate (1,3BPG), and then 6 NADPH donate their high energy electrons to the 1,3BPG to become 6 G3P or Glyceraldehyde-3-Phosphate

Question 16

What happens to the 6 G3P made

Answer 16

1 G3P is sent to make more sugar and 5 G3P are sent to regenerate RuBP

Question 17

What is happening in Phase 3: Reformation of RuBP

Answer 17

5 3-Carbon G3P molecules are phosphorylated by ATP to become 3 5-Carbon molecules called RuBP

Question 18

What type of compound creates PGA after RuBP in Phase 1

Answer 18

An unstable intermediary compound