100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary WJEC (Wales) biology unit 1.1 Chemical elements joined to form compounds - proteins notes £6.49   Add to cart
Quickly navigate to
Preview
  2.  
  3. WJEC
  4.  
  5. Biology
  6.  
  7. Unit 1.1 chemical elements joined to form compound

Summary

Summary WJEC (Wales) biology unit 1.1 Chemical elements joined to form compounds - proteins notes
 2 views  0 purchase

A full summary of unit 1.1 Chemical elements joined to form compounds (proteins) for the syllabus of WJEC (Wales). It contains all the details that A-level students should memorise before entering the exam hall. There are also some answering techniques and answer formats for exam-type questions.

Preview 1 out of 2  pages

Document information

  • July 27, 2024
  • 2
  • 2022/2023
  • Summary

Subjects

Written for

All documents for this subject (2)

Seller

avatar-seller
aliesefan2

Content preview

Proteins
 Contains C, H, O, N, may hv S/P
 Macromolecules, many amino acids -> polypeptide chain
 Function: enzyme rxns, oxidation (e.g. respiratory chain), structure, storage, transport, cell
signalling, defence, plasma membrane

Structure of amino acids:
 20 types
 R group: can hv quite diverse chemical properties
contain S -> disulphide bridges
can be charged/polar/non-polar/aromatic/alkaline/acidic
 Essential – from diet




*Cysteine can form disulphide bridges (covalent bonds), Glycine
*amino acid -> dipeptide -> polypeptide -> complete polypeptide chain


Dipeptide:
 = 2 amino acids join tgt
 Order controlled by genes on chromosomes
 Condensation rxn




Protein structure:
 Conformation dependent upon amino acid sequence
 Fold according to their function
Four levels:
1. Primary
= no., type & sequence of amino acid in a protein
Polypeptide chains form from peptide bonds
2. Secondary α-helix
= bonding between peptide bonds on the chain (H bonds)
Could be:
a) α-helix
= coiled protein, twisted into 3D shape
H bonds in every 3rd amino acid -> strong structure
b) β-pleated sheet
β-pleated
= folded protein
lie parallel to each other but run opposite directions
-> complex structure

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 aliesefan2. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £6.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

84251 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
£6.49
  • (0)
  Add to cart