100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
cell membranes summary £3.49   Add to cart

Summary

cell membranes summary

 15 views  0 purchase

a coincise summary of cell membranes: their roles and structure, different types of transport, effect of temperature and solvents on cell membranes, diagram of the phospholipid bilayer, effect of pure water and concentrated solution on animal and plant cells. bullet points to summarise sequence o...

[Show more]

Preview 2 out of 8  pages

  • January 4, 2024
  • 8
  • 2023/2024
  • Summary
All documents for this subject (73)
avatar-seller
erikakumar
BIOLOGY
CELL MEMBRANES

ROLES

○ Boundary barrier separates aqueous mediums with different chemicals

○ Control passage of molecules in and out of the cell

○ Compartmentalisation: formation of separate membrane-bound areas in a

cell

○ Site for chemical reactions where enzymes attach to membranes

○ Site of generation of ATP in inner membrane of mitochondria and

chloroplasts

○ Cell signalling: has chemical receptors

○ Cell recognition: of self and non-self cells

○ Cell adhesion: cells stick together to form tissues


FLUID MOSAIC MODEL

Fabric of membrane : phospholipid bilayer with proteins floating randomly in it, forming a

mosaic pattern.

Phospholipids are free to move around, giving membrane its flexibility

Proteins are embedded in the membrane that are free to move around, vary in shape, size

and position (in the same way the tiles of a mosaic), so are randomly scattered or

distributed throughout the membrane.




1

, Model: agreed structure based upon experimental evidence that supports this idea.




COMPONENTS

Phospholipids: bilayer separates aqueous environments where cells normally exist

- Hydrophilic heads (phosphate groups) interact with water

- Hydrophobic tails repel water, so point inwards, away from water

Cholesterol: hydrophilic head and hydrophobic end

-positioned between phospholipids in a bilayer: hydrophilic end interacts with heads;

hydrophobic end interacts with tails, pulling them together - adding stability to membrane

without making them too rigid, reducing the mobility of phospholipids.

- prevent the membrane becoming too solid by stopping the phospholipid molecules from

grouping too closely and crystallizing.

● Regulates fluidity of membrane

Glycoproteins: have attached carbohydrate chains

● Cell adhesion

● Cell signalling : act as receptors for hormones and neurotransmitters, which when

binding to receptor, elicits direct response from cell or cascade of events.


2

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

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 erikakumar. 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.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

80461 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

Start selling
£3.49
  • (0)
  Add to cart