Photosynthesis and respiration

Question 1

acetyl coenzyme A and its role in respiration

Answer 1

Coenzyme - formed from the link reaction when acetate combines with coenzyme A. Then combines with oxaloacetate to form citrate. Coenzyme A goes back to the link reaction.

Question 2

chemiosmosis

Answer 2

process of electrons flowing down the electron transport chain, creating a proton gradient across the membrane to drive ATP synthesis

(energy lost from electron transport chain is used to transport protons into the thylakoid so it has a higher concentration than stroma, protons move down concentration gradient into stroma via ATP synthase in thylakoid membrane, energy from movement combines ADP + Pᵢ to form ATP)

Question 3

chlorophyll

Answer 3

a photosynthetic pigment found in thylakoid membrane of chloroplasts
absorbs the light energy needed for photosynthesis
pigment attached to proteins = photosystem
different types (chlorophyll a + b)

Question 4

coenzyme

Answer 4

molecule that aids the function of an enzyme
They work by transferring a chemical group from one molecule to another.

Question 5

compensation point

Answer 5

point at which the rate of photosynthesis exactly matches the rate of respiration

Question 6

saturation point

Answer 6

the point at which a factor is no longer the limiting factor - something else has become the limiting factor