5.1- Photosynthesis Flashcards
(22 cards)
Explain the light dependent reaction
Chlorophyll absorbs light energy, this causes electrons to be excited and omitted this is called photoionisation, water undergoes photolysis in the thylakoids lumen forming 4H plus plus 4E minus +02 O2, the electrons replace those lost from the chlorophyll molecule, the electrons move down the electron transport chain in a series of redox reactions, the electrons lose energy as they move down there ETEC and this is used to pump H plus from the stroma Into the thylakoids looming, therefore the H plus defuses through ATP synthase back into the stroma causing ADP plus PI to form ATP, at the end of the ECC the electrons combined with any DP and H plus irons from reduced NADP
Where does the light dependent reaction occur
Along the thylakoids membrane/Graham Graham Graham now
What is the reduced NADP from the light dependent reaction used for
To provide the hydrogen to reduce GP to GP in the light independent reaction
What is the ATP from the light dependent reaction used for
To provide the energy to reduce GP to GP and to provide the energy to convert TP into our UBP in the light independent reaction
Explain the light independent reaction
Are you BP combined with CO2 catalysed by RuBisCO. This forms to molecules of GP. The GP is reduced to form TP. Five sixth of the TP is used to regenerate RU BP1 stop 1/6 of the TP is converted to useful organic molecules such as glucose
Where does the light independent reaction occur occur
Stroma of the chloroplast
How many times does the Calvin cycle have to turn to generate one with the cure of glucose
Six
Give two factors that mainly affect the light independent reaction
Temperature and carbon dioxide concentration
What factor mainly affects the light dependent reaction
Light intensity
How does temperature affect photosynthesis
It is mainly dependent on enzyme controlled reactions therefore a higher temperature causes more kinetic energy therefore more and that some sort of substrate complex is a form for second
How does light intensity affect photosynthesis
The light is absorbed by the chlorophyll and causes electrons to be excited and committed
How does CO2 concentration affect photosynthesis
CO2 reacts with our UBT to form two molecules of GP in the light independent reaction some more CO2 causes more GP et cetera
When working with extracts of chloroplasts why is it important to keep them cold
To reduce enzyme activity so that the organelles are not damaged
How can the CPAP be used to measure the rate of photosynthesis in chloroplasts
TCP/IP picks up electrons and this causes it to turn colourless the electrons could come from the reduced NADP or from the end of the electron transport chain in the light dependent reaction the faster it turns colourless the faster the rate of photosynthesis
How can the control variable pH be controlled
PH buffer
What are some controlled variables when investigating rate of photosynthesis
PH of solution, temperature, mass of chloroplasts, light intensity
How can temperature be controlled
Use of water bath
How can mass of chloroplasts be controlled
Use a balance to measure mass
How can light intensity be controlled
Distance from lamp
How can we investigate the effect of carbon dioxide on photosynthesis
Dissolve different amounts of bicarbonate into the solution of chloroplast
How can light intensity be investigated in rate of photosynthesis
Distance from lamp
How can temperature be investigated on rate
Different coloured water barfs
