Photosynthesis Uses Light Energy Flashcards
How are chloroplasts transducers?
Turn energy in photons of light into chemical energy mad available through ATP.
What are the main 2 classes of pigments that act as transducers on flowering plants?
Chlorophylls
Carotenoids
What are the 2 chlorophyll pigments?
Chlorophyll a
Chlorophyll b
What are the 2 carotenoids pigments?
B carotene
Xanthophylls
Definition of absorption spectrum
A graph showing how much light is absorbed at different wavelengths
What is an antenna complex?
An array of protein and pigment molecules in the thylakoid membranes that transfer energy from light of a range of wavelengths to chlorophyll a at reaction centre
How do plants synthesise carbohydrates?
- first hexose made is fructose phosphate, converted to fructose
- combined with glucose to make sucrose- transport around the plant
- a glucose converted to starch for storage
- b glucose polymerised into cellulose for cell walls
How do plants synthesise fats?
- acetyl coenzyme A synthesised from GP and converted to fatty acids
- Triose phosphate can be converted directed to glycerol
- fatty acids and glycerol undergo condensation reactions to form triglycerides
How do plants synthesise proteins?
GP converted to amino acids
What are the limiting factors of photosynthesis?
Carbon dioxide concentration
Light intensity
Temperature
Water
Definition of limiting factor
A factor that limits the rate of a physical process by being short in supply
Definition of rate limiting step
The rate of the slowest reaction in a sequence determines the overall rate of the process.
