100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Biology ib membranes notes R72,05
Add to cart

Class notes

Biology ib membranes notes

 14 views  0 purchase
  • Course
  • Institution
  • Book

This document provides detailed information about membranes with ib biology syllabus includes. There are notes from the textbook, powerpoints and past papers. I recommend looking over this document for review and memorizing the facts for a test.

Preview 2 out of 9  pages

  • January 17, 2024
  • 9
  • 2023/2024
  • Class notes
  • Not mentioned
  • Biology
  • Unknown
avatar-seller
Membranes and membrane transport


Phospholipid bilayer

https://www.biologyforlife.com/membranesandtransport.html

https://quizlet.com/852395733/b21-membranes-and-membrane-transport-flash-cards/




Hydrophophillic head is made up of glycerol and phosphate. The hydrophobic tail is made up of
fatty acids.

Big things go inside the cell membrane through the protein shell.

B2.1.1-B2.1.4 ( except B2.1.3) on PowerPoints.

B2.1.9-B2.1.13 on PowerPoints


What can move into the cell and what can’t

• Gases, hydrophobic molecules, and small polar molecules can move into the cell easily.
Examples:
• Oxygen
• Carbon dioxide
• Benzene
• Ethanol
• Large polar molecules and charged molecules can’t move into the cell. Examples:
• Glucose, amino acids Sodium, chlorine, calcium and hydrogen.

, • Why can hydrophobic molevueles move through but not hydrophilic: Molecules that are
hydrophobic can easily pass through the cell membrane, if they are small enough, because
they are water-hating like the interior of the membrane. Small lipids and steroids are
hydrophobic and can readily cross the membrane. They won’t dissolve in the membrane.



What the membrane is made of: Cholesterol

• It’s inside the membrane and only animal cells can have cholesterol.
• It’s a type of steroid (lipid).
• Higher temps- stiffens membrane.
• Lower temps- prevents membrane from freezing.
• Cholesterol is also a key determinant of membrane fluidity: at high temperatures,
cholesterol acts to stabilize the cell membrane and increase its melting point; while at low
temperatures, it inserts into phospholipids and prevents them from interfering with each
other.



What the membrane is made of: Recognition Proteins

• These proteins have carbohydrate chains attached.
• Carbohydrate chains aid in cell identification. Examples are red blood cells and white blood
cells which identify viruses as foreign.




What the membrane is made of: Receptor Proteins

• These proteins receive chemical signals from other cells such as nervous system cells.
• Exam question: They can show us a pic of either a recognition or receptor protein and ask us
the function.

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 EFT, credit card or Stuvia-credit 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 this summary from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller anukikilasonia. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy this summary for R72,05. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

52355 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy summaries for 14 years now

Start selling
R72,05
  • (0)
Add to cart
Added