OCR Biology Photosynthesis 5.2.1 Revision summary - By A* Student
2 views 0 purchase
Course
Photosynthesis 5.2.1 (H420)
Institution
OCR
A revision summary of OCR A level Biology Photosynthesis 5.2.1
Made by a student who achieved A* in A level Biology.
Covers all the points within the OCR Biology Specification.
Condenses 3 OCR specification books and class notes.
Photosynthesis – light energy is converted into chemical energy to Cyclic phosphorylation
synthesise organic molecules. (Inorganic to organic) 1. Only PSⅠ(P680)
6CO2 + 6H2O C6H12O6 + 6O2 Respiration 2. Light energy excited e- to higher energy level
Carbon Dioxide + Water Glucose + Oxygen - Uses O2 3. 2e- pass into ETC (Fe2+ containing proteins
- Light energy trapped by chlorophyll molecules used to drive produced from accept & donate 2e- in redox reactions)
synthesis. photosynthesi 4. ETC generates small amount of ATP
- Compensation point – respiration & photosynthesis in plant occur s 5. 2e- leaving ETC are recycled & returned to PSⅠ
at same rate = no net gain/ loss of carbohydrate. - Organic Cyclic Non-cyclic
Autotrophs – synthesis organic molecules from inorganic molecules molecules Molecules? Inorganic Inorganic
Chemoautotrophs – oxidise ammonia to nitrate (nitrifying bacteria) broken into organic organic
Photoautotrophs – use light & CO2 to create sugars and complex inorganic PSⅠ? Yes Yes
carbs (plants) - Energy PSⅡ? No Yes
Respiration Photosynthesis released used Where Recycled in ETC
Molecul Inorganic to organic Organic to inorganic to synthesis does ETC
es ATP PSⅠget e-?
Reactan Glucose & oxygen Water & carbon dioxide - CO2 produced Where Photolysis -
ts used in does PSⅡ H2O
Product Water & carbon dioxide Glucose & oxygen photosynthesi get e-?
s s. Products? ATP ATP, rNADP,
Reaction Exothermic – release Endothermic – trap energy O2,
Grana - made of stacks of thylakoids =
↑membrane SA
Stroma - enzymes for catalysis of LD reactions &
holds LD stage products.
Lipid droplets – pplipid bilayer
Photosystem – protein embedded within thylakoid membrane.
Primary Pigment is Chlorophyll-a in reaction centre absorbs red/green
- Fatty acid tail (can embed itself CSM)
- Mg2+ ion can lose electrons.
- PSⅠ – has chlorophyll P700 (max absorption at 700nm)
- PSⅡ – has Chlorophyll P680 (max absorption at 680nm)
Accessory pigments - chlorophyll-b, xanthophyll, carotenoids
- Each absorb specific freq of wavelengths
- pass photons of light energy to primary pigment
- Allow for maximum absorption of light.
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 hyaldridge. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.16. You're not tied to anything after your purchase.
