L9 Photosynthesis

Question 1

Where does the light reactions take place?

Answer 1

Thylakoid membrane

Question 2

What is the Thylakoid membrane protein complexes made of?

Answer 2

(1) Photosystem two (PStwo)
(2) Cytochrome bf complex
(3) Photosystem one (PSone)
(4) ATP synthase

The first three is used for electron transport

Question 3

How many ATP are generated per O2 generated?

Answer 3

3

Question 4

What is the reaction centre of phoxidation?

Answer 4

P680

Question 5

What is the final electron acceptor in Photosystem II?

Answer 5

Plastoquinone (PQ)

Question 6

Which component in the ATP synthase act as a passage of proton from lumen to stroma?

Answer 6

CF0

Question 7

What is the function of CF1 in the ATP sythase?

Answer 7

Formation of ATP from ADP (photophosphorylation)

Question 8

PS two and cytochrome b6f mainly occur in which part in the thylakoid membranes?

Answer 8

Stacked membrane

Question 9

According to the theory explaining the ecolution of chloroplast, whcih kind of bacteria is responsive for the origin of PS two?

Answer 9

Purple bacteria

Question 10

According to the theory explaining the ecolution of chloroplast, whcih kind of bacteria is responsive for the origin of PS one?

Answer 10

Green sulfur bacteria

Question 11

Photosynthesis might be thought of the reverse of which two reaction?

Answer 11

Glycolysis and TCA cycle

Question 12

What are the three stages of Calvin Cycle?

Answer 12

(1) Carboxylation
(2) Reduction
(3) Regeneration

Question 13

What is the enzyme responsible for Carboxylation stage?

Answer 13

Ribulose bisphosphate carboxylase (Rubisco)
*Rubisco is the most abandunt protein on earth

Question 14

What mainly happens in the reduction stage of the dark reaction?

Answer 14

Formation of glyceraldehyde-3-P

Question 15

What mainly happens in the third stage of the dark reaction?

Answer 15

Regeneration of ribulose 1,5-bisphosphate

Question 16

Where does the starch biosynthesis occurs?

Answer 16

Chloroplast stroma

Question 17

Where does the sucrose biosynthesis occurs?

Answer 17

Cytosol

Question 18

Give a brief definition of photorespiration

Answer 18

Light-driven metabolic process with no carbon fixation

Question 19

What is the product of oxygenase activity of Rubisco?

Answer 19

2-phosphoglycolate

Question 20

Which pathway salcages 2-phosphoglycolate to form 3-phosphoglycolate?

Answer 20

Glycolate pathway
There are ATP requirement and releases of CO2