3.5.1 Photosynthesis, LDR and LIR (Unit 5 Energy Transfers) Flashcards
Describe how NADP+ is reduced in the LDR of photosynthesis.
2e- from electron carrier protein (originally from chlorophyll) are gained.
H+ is gained from stroma.
What are the products of the light dependent reactions of photosynthesis?
ATP
NADPH (Reduced NADP)
Oxygen
Identify the labels.
Identify the labels.
Why is ATP sometimes referred ot as an immediate energy source of energy?
Because only one bond needs ot be broken to release energy.
ATP is rapidly resynthesised.
In biology what is meant by OXIDATION?
The loss of electrons
The loss of hydrogen
The gain of oxygen
For what are the products of the light dependent reactions used for?
NADPH and ATP are required in the light independent reacitons of photosynthesis (Calvin cycle)
Oxygen is used in respiraiton or exits the plant via the stomata.
Why does the plant need to carry out the respiration if the light dependent reactions produce ATP?
Not enough ATP is produced.
ATP is difficult to transport around the plant.
So ATP can be produced in the dark.
Not all plant cells contain chlorophyll
ATP is not a stable store of energy.
Identify the labels.
In biology, what is meant by REDUCTION?
The gain of electrons.
The gain of hydrogen.
The loss of oxygen.
Describe the Light Dependent Reactions of photosynthesis.
In photoionisation, light excites the electrons in chlorophyll II and they move to carrier proteins in the thylakoid membrane.
The electrons are replaced by the e- produced by splitting water (photolysis), which also produces oxygen and H+.
Electrons move along carrier proteins in a series of redox reactions losing energy as they go. This is used to pump H+ into the thylakoid space creating a chemiosmotic gradient.
H+ move down the gradient through ATP synthase during photophosphorylation producing ATP from ADP+Pi
The electrons are donated to chlorophyll I and more are excited by light, travelling along another ETC until they reduce NADP to NADPH with H+ from photolysis.
Identify the labels.
Identify the labels.
What does the diagram show?
The thylakoid membrane of a chloroplast.
Where the light dependent reactions of photosynthesis take place.
What is NADP?
A coenzyme/cofactor that works alongside an enzyme, in this case it is a hydrogen carrier and electron acceptor.