Biology molecules AQA AS Biology PART 3 of 8 TOPICS: Proteins

A quick summary on everything that you need to know on proteins. Enzymes is the next topic after this which is classed as a seperate topic.

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Preview of Biology molecules AQA AS Biology PART 3 of 8 TOPICS: Proteins

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Biological molecules (AQA AS Biology) PART 3 of 8 TOPICS: Proteins
Proteins:
Amino acids are the monomers of proteins. The structure of these molecules should be known:
A condensation reaction between two of these amino acids
will remove a water molecule and form a peptide bond to
create a Dipeptide. Polypeptides are chains of many amino
acids joined by the same reaction where this chain is referred
to as a primary structure. Secondary structure is where the
primary structure is folded into an alpha helix or a beta
pleated sheet. Tertiary structure is the further folding of the
structure which is held by hydrogen bonds, ionic bonds and
disulphide bridges. Quaternary structure is where there is
more than one polypeptide chain.
Some proteins are functional and can be primary, secondary, tertiary or quaternary structures. The
functions involved are as an energy source, for structure (hair), as enzymes and carrier proteins,
hormones, antibodies and are used as a buffer.
Knowing the tests for proteins needs to be known for the exam
Proteins
Add KOH and mix (quantities do not need to be known)
Add copper sulphate solution and mix (quantities do not need to be known)
RESULT
Purple is colour is observed

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