photosynthesis and respiration Flashcards
1
Q
What is a photosystem?
A
a funnel-like structure that absorbs and transes light energy to the primary reaction centre
2
Q
What is photoionisation?
A
when the reaction centre is ionised/oxidised by light energy
3
Q
What are co-enzymes?
A
molecules needed by enzymes for oxidation and reduction reactions
4
Q
Where do light dependent reactions take place?
A
thylakoid membrane
5
Q
Photolysis equation
A
H20 –> 2H+ +2e- + 1/2 O2
6
Q
What are 2 products needed for light independent reactions?
A
ATP
NADPH
7
Q
Describe how plants use light energy during light-dependant reactions (5)
A
- light energy excites the electron
- electron then moves along electron transfer chain dissipating energy
- the enrgy is used to join ADP and Pi to make ATP (phosphorylation)
- photolysis of water produces protons, electrons and water
- NADP is then reduced by electrons into NADPH
8
Q
What is photolysis?
A
the chemical process by which molecules are broken down into smaller units by the use of light
9
Q
A
