Photosynthesis

Question 1

Stages of photosynthesis (and where do they occur)?

Answer 1

• Light dependent reactions (thylakoid membrane)

- Light independent reactions (Calvin Cycle) (stroma)

Question 2

Where does the photon go?

Answer 2

Hits a reaction center in Photosystem II and hops around, gaining energy, until it reaches chlorophyll a

Question 3

Summarize LDR

Answer 3

• Chlorophyll a oxidised, electron moves to electron acceptor and then down ETC
• Reaches PS I, goes to another electron acceptor and down another ETC with Fd (ferrodoxin)
• NADP reduced by NADP+ reductase

Question 4

Which enzyme is used in Calvin Cycle + its purpose?

Answer 4

RuBisCO (ribulose bisphosphate carboxylase/oxygenase).

It adds carbon to Ribulose Bisphosphate

Question 5

Structure of RuBP?

Answer 5

Pentose sugar + 2 phosphate groups

Question 6

What is produced during the Calvin Cycle and how long does it take

Answer 6

G3P is produced after 3 cycles. Therefore total of 6 cycles required to make glucose

Question 7

What are the limitig factors of photosynthesis?

Answer 7

• Carbon dioxide
• Temperature
• Light intensity & quality
• Nutrients