Photosynthesis

Question 1

What happens in the first stage of photosynthesis

Answer 1

Light energy is absorbed by a pigment and creates high energy electrons, electrons go through electron transport chain and release energy to generate ATP by ATP synthase, energy used to split water (photolysis), hydrogen ions transferred to NADP to make NADPH for second stage

Question 2

What is the first stage called

Answer 2

Photolysis

Question 3

What is the second stage called

Answer 3

Carbon fixation (Calvin cycle)

Question 4

What happens in the second stage of photosynthesis

Answer 4

CO2 enters the cycle and attaches to RuBP (reaction controlled by RuBisCo), Cu2+RuBP to make 3PG, 3PG is phosphorylated by ATP and combines with hydrogen ions from NADPH which produced G3P, some G3P is then used to regenerate RuBP and the remainder is used to synthesise glucose.

Question 5

What is RuBP

Answer 5

Ribulose bisphosphate

Question 6

What is 3PG

Answer 6

3-phosphoglycerate

Question 7

What is G3P

Answer 7

Glyceraldehyde-3-phosphate

Question 8

What are the uses of Glucose

Answer 8

Respiration, starch (storage carbohydrate), cellulose (structural carbohydrate), biosynthesis pathways

Question 9

What are the biosynthesis pathways

Answer 9

DNA, protein, fat