chapter 5 exam 3 questions

Question 1

What are the 3 steps of the Calvin cycle?

Answer 1

1. Carbon fixation
2. PGAL synthesis
3. regeneration of RuBP

Question 2

What generally occurs in each of the 3 steps of the Calvin cycle?

Answer 2

carbon fixation: carbon is added to RuBP creating an unstable molecule
PGAL synthesis: the unstable intermediate splits to form PGAL
Regeneration of RuBP: RuBP is regenerated by rearranging the remaining molecules

Question 3

How many carbons atoms are
found in 1 molecule of RuBP, CO2, PGA, and glucose

Answer 3

RuBP: 5
CO2: 1
PGA: 3
Glucose: 6

Question 4

What is the enzyme responsible for combining
RuBP with CO2?

Answer 4

Rubisco

Question 5

What is required to convert PGA to PGAL?

Answer 5

ATP and NADPH

Question 6

What is required to convert PGAL to RuBP?

Answer 6

ATP

Question 7

What occurs if RuBP is not available?

Answer 7

Photorespiration

Question 8

What is photorespiration?

Answer 8

a process where the plant uses oxygen instead of carbon dioxide in the Calvin cycle

Question 9

How are C3 plants generally different from C4 and CAM plants?

Answer 9

C3 plants use the Calvin cycle alone for carbon fixation.