Cyclic Photophosphorylation / Electron Flow: Pathway 1

Question 1

What is the scientific name for the electron flow pathway 1?

Answer 1

Cyclic photophosphorylation

Question 2

What happens to the high energy electrons once they have been passed to the electron acceptor in the cluster of pigments in the grana?

Answer 2

The high-energy electrons pass from the electron acceptor to a series of other electron acceptors and back again to the chlorophyll molecule

Question 3

Where does the high-energy electron return to?

Answer 3

The chlorophyll molecule associated with the electron acceptor in the cluster of pigments

Question 4

How many high energy electrons are released from the electron acceptor in cyclic photophosphorylation?

Answer 4

Just one electron is released at a time

Question 5

Where in the cell does cyclic photophosphorylation take place?

Answer 5

This process remains in the grana of the chloroplast i.e. it doesn’t move

Question 6

Why are the electrons said to recycle in this stage?

Answer 6

As the same electron that leaves the reaction centre chloroplast returns to it at the end of the cycle

Question 7

What happens to the high energy electrons as they pass through the series of electron acceptors?

Answer 7

They loose energy

Question 8

What happens to the energy lost by the high energy electron as it passes through a series of electron acceptors?

Answer 8

This energy is trapped by ADP and a phosphate and then used to form ATP and water

Question 9

What does ADP stand for?

Answer 9

Adenosine diphosphate

Question 10

Give the chemical formula for the formation of ATP and water.

Answer 10

ADP + energy + P –> ATP + water

Question 11

What is the common name for this flow of electrons?

Answer 11

Cyclic electron flow