AQA A Level Biology - Photosynthesis Questions And Answers
9 views 0 purchase
Course
AQA A Level Biology
Institution
AQA A Level Biology
AQA A Level Biology - Photosynthesis Questions And Answers
What are the two stages of photosynthesis called>
The Light Dependent reaction
The Light Independent reaction (The calvin cycle)
What is the purpose of photosynthesis?
To energy from light is used to make glucose
What is the gene...
AQA A Level Biology - Photosynthesis
Questions And Answers
What are the two stages of photosynthesis called>
The Light Dependent reaction
The Light Independent reaction (The calvin cycle)
What is the purpose of photosynthesis?
To energy from light is used to make glucose
What is the general equation for photosynthesis ?
6H2O + 6CO2 + energy --> C6H12O6 + 6O2
What are the x stages of the light dependent reaction ?
1. Photoionisation of PSII
2. Photolysis of water
3. Photoionisation of PSI
4. Active transport of H+ ions
5. Oxidative phosphorylation
6. Reducing NADP
Describe what happens during photoionisation of PSII
Chlorophyll absorbs light
Electrons excited and move to higher energy level
Electrons move down electron transport chain to PSI
Describe what happens during photolysis of water
Light energy splits water molecules into H+, e- and oxygen
The electrons replace those lost from PSII during photoionisation
Explain how H+ ions are moved across the thylakoid membrane
The excited electrons from photoionisation lose energy as they move down the
electron transport chain
The energy is used to actively transport H+ into the chloroplast
Explain how H+ are involved in the synthesis of ATP in chloroplasts
H+ move down their concentration gradient into the stroma
This is via ATP synthase in the thylakoid membrane
The energy synthesises ATP from ADP and Pi
Explain why the photoionisation of PSI is important
, The excited eletrons are transferred to NADP with H+ to form reduced NADP
This is needed for the light-independent reaction
What is chemiosmosis ?
Electrons move down the electron transport chain and creating a proton gradient
This drived ATP synthesis
Which molecules from the light-dependent reaction are needed in the light-
independent reaction?
ATP
reduced NADP
Where does the light dependent reaction take place?
(acrodd) thylakoid membranes of chloroplasts
Where does the light-independent reaction take place?
Stroma of chloroplasts
What are the 3 stages of the light-independent reaction?
1. Formation of glycerate 3-phosphate
2. Formation of triose phosphate
3. Regeneration of ribulose bisphosphate
Explain how glycerate 3-phosphate (GP) is formed
Ribulose bisphosphate (RuBP) combines with CO2
Forms unstable 6 carbon compound which breaks down to give 2 molecules of
glycerate 3-phosphate
Catalysed by Rubisco
How does CO2 enter the stroma from the atmosphere?
Diffusion through the stomata
Difussion into the stroma
Which enzyme catalyses the reaction of CO2 with ribulose bisphosphate
(RuBP) ?
Rubisco
How many molecules of glycerate 3-phosphate (GP) are produced from 1
molecule of CO2 and 1 molecule of ribulose bisphosphate (RuBP) ?
2
How many carbon atoms are in ribulose bisphosphate ?
5
How many carbon atoms are in glycerate 3-phosphate (GP) ?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller MUTUKACOURSEHERO. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.49. You're not tied to anything after your purchase.
