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 (PS II)
(2) Cytochrome bf complex
(3) Photosystem one (PS I)
(4) ATP synthase

The first three is used for electron transport

Question 3

What is the final electron acceptor in Photosystem II?

Answer 3

Plastoquinone (PQ)

Question 4

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

Answer 4

F0

Question 5

What is the function of F1 in the ATP sythase?

Answer 5

Formation of ATP from ADP (photophosphorylation)

Question 6

PS II and cytochrome bf mainly occur in which part in the thylakoid membranes?

Answer 6

Stacked membrane

Question 7

According to the theory explaining the evolution of chloroplast, which kind of bacteria is responsible for the origin of PS II?

Answer 7

Purple bacteria

Question 8

According to the theory explaining the evolution of chloroplast, whcih kind of bacteria is responsible for the origin of PS I ?

Answer 8

Green sulfur bacteria

Question 9

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

Answer 9

Glycolysis and TCA cycle

Question 10

What are the three stages of Calvin Cycle?

Answer 10

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

Question 11

What is the enzyme responsible for Carboxylation stage?

Answer 11

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

Question 12

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

Answer 12

Formation of glyceraldehyde-3-P

Question 13

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

Answer 13

Regeneration of ribulose 1,5-bisphosphate

Question 14

Where does the starch biosynthesis occurs?

Answer 14

Chloroplast stroma

Question 15

Where does the sucrose biosynthesis occurs?

Answer 15

Cytosol

Question 16

Give a brief definition of photorespiration

Answer 16

Light-driven metabolic process with no carbon fixation

Question 17

What is the product of oxygenase activity of Rubisco?

Answer 17

2-phosphoglycolate

Question 18

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

Answer 18

Glycolate pathway
There are ATP requirement and releases of CO2

Question 19

What is the metabolites in C4 plants represents the first product of CO2 fixation?

Answer 19

oxaloacetate, which is formed from Ribulose 1,5-bisphosphate

Question 20

Which of the folloing reaction types are not found in the Calvin cycle?
A. Carboxylation
B. Transketolase reaction
C. Substrate level phosphorylation
D. Reduction reaction

Answer 20

Substrate level phosphorylation is not found