Photosynthesis Flashcards
Why must water potentials be the same in DCPIP experiment
Same water potential so osmosis does not occurr so organelle does not shrink or burst
What happens in the light dependent reaction?
Light energy is absorbed by chlorophyll and some of this energy is transferred to chemical energy in ATP. NADPH is produced
What happens in the calvin cycle?
RuBP to Glycerate 3 phosphate to triose phosphate back to RuBP
What is a thylakoid?
Disc shaped membrane, membrane bound structures found inside chloroplasts
What is a grana?
Groups of thylakoids arranged in stacks
What happens in photo ionisation?
The process by which a chlorophyll molecule becomes positively charged as a result of losing two electrons when it absorbs light
What is the electron transfer chain?
A series of electron carriers arranged within a membrane that can accept and then pass on electrons
What are the limiting factors of photosynthesis?
Light intensity
Carbon dioxide concentration
Temperature
Availability of water in soil
First step of light independent reaction?
Carbon dioxide reacts with RuBP to form 2 molecules of glycerate 3-phosphate
What is the first stage of light independent reaction catalysed by?
Rubisco
2nd stage of light independent reaction?
GP reduced to triose phosphate. This is a reduction reaction
What does second stage of light dependent reaction require?
Reduced NADP and ATP
What is NADP used for in the light independent reaction?
To reduced GP
What is ATP used for in the light independent reaction?
To provide additional energy for the reaction
What are some substances that triose phosphate is converted into?
Sucrose for transport
Cellulose for storage
Amino acids
Most triose phosphate is converted into glucose, what is this glucose used for?
Respiratory substrate or to regenerate more RuBP
Describe inner membrane of a chloroplast?
Folded into lamallae
One granum consists of several stacked thylakoids
Between the granum is the intergranal lamalae
Describe chloropast adaptations?
Many grana provide a large surface area for photosynthetic pigments
Proteins embedded into grana hold photosystems in place
How does the light dependent stage of photosynthesis start?
Proton hits a chlorophyll molecule
How many carbons does RuBP have?
5
How are 2 molecules of glycerate 3 phosphate formed?
CO2 combined with RuBP with the enzyme rubisco
Where is one carbon lost is the calvin cycle?
2x triose phosphate to RuBP
What is the lost carbon atom used for in the carbon cycle?
To make useful products
What is a waste product of photosynthesis>
Water
