3.1.4 - proteins

3.1.4.1 - 3.1.4.2

what monomers are proteins made from

amino acids

diagram of general structure of amino acids

what does each part in the diagram represent?

• NH₂ - an amine group

• COOH - a carboxyl group

• R - a side chain

how many amino acids are common in all organisms?

20

what is the only way in which they differ?

in their side group

how is a peptide bond formed

by a condensation reaction between two amino acids

what are dipeptides formed by?

the condensation of 2 amino acids

what are polypeptides formed by?

the condensation of many amino acids

how many polypeptides does a functional protein contain?

1 or more polypeptides

KNOW the role of hydrogen bonds, ionic bonds and disulfide bridges in the structure of proteins.

KNOW THE relationship between primary, secondary, tertiary and quaternary structure, and protein function.

KNOW THE biuret test for proteins

many proteins are…

enzymes

what does an enzyme do in the reaction it catalyses

lowers the activation energy

KNOW THE induced fit model of enzyme action.

what do the properties of an enzyme relate to?

• the tertiary structure of its active site

• its ability to combine with complementary substrate(s) to form an enzyme-substrate complex

spec points to make flashcards on

3.1.4.2, all the bullet points and everything after that, and the RQ1