Summary
Summary OCR AS/A LEVEL BIOLOGY CELL STRUCTRURE NOTES
- Module
- H420 (BIOLOGY)
- Institution
- OCR
has information according to the specification
[Show more]
Seller
Follow
Content preview
CELL STRUCTURE:NUCLEUS (Nuclear envelope/nucleolus/nuclear pores)
• Controls the cell’s activities
• Contains + transmits the cell’s genetic information
• Provides instructions for protein synthesis
• Nucleus is surrounded by a double membrane ---> nuclear envelope
(pores in the nuclear envelope, that allow large substances in and out
of the nucleus)
• Nucleolus contains RNA and is where ribosomes are made
• Chromatin is the genetic material (shows up as dark patch on
diagrams)
ROUGH ENDOPLASMIC RETICULUM (RER)
• System of membranes, containing fluid-filled sacs(cisternae).
• Coated with ribosomes for protein modification.
• Intracellular transport system
SMOOTH ENDOPLASMIC RETICULUM (SER)
• System of membranes, containing fluid-filled sacs(cisternae)
• No ribosomes
• Contains enzymes that catalyse reactions involved with lipid
metabolism
, • Absorbs, transports and synthesise lipids.
GOLGI APPARATUS
• Stack of membrane-bound flattened sacs
• Secretory vesicles bring materials to and from the Golgi body
• Where proteins are modified and packaged into vesicles.
MITOCHONDRIA
• Surrounded by 2 membranes, with fluid in-between them
• Inner membrane folds into cristae
• Inner part of mitochondria is a fluid-filled matrix.
CHLOROPASTS
• Have a double membrane
• Inner membrane is filled with stacks of thylakoids, which contain
chlorophyll.
• Each stack of thylakoids is called a granum.
• Fluid-filled matrix is called the stroma
• Contain loop of DNA
• Site of photosynthesis
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 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 nafisarabbani24. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £7.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83100 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now