Proteins

Question 1

what monomers are proteins made from

Answer 1

amino acids

Question 2

what is a dipeptide

Answer 2

two amino acids joined via condensation

Question 3

whats a polypeptide

Answer 3

more than amino acids joined together via condensation

Question 4

whats a protein

Answer 4

more than one polypeptide

Question 5

whats the general structure of an amino acid

Answer 5

a carboxyl group -COOH
an amine group -NH2
a R group with carbon attached

Question 6

what is the bond between amino acids called

Answer 6

peptide bonds

Question 7

describe the primary structure of a protein

Answer 7

sequence of amino acids in a polypeptide chain

Question 8

describe the secondary structure of a protein

Answer 8

hydrogen bonds form between the amino acids in the polypeptide chain
this forms an alpha helix or beta pleated sheet

Question 9

describe the tertiary structure of a protein

Answer 9

the helix / sheet coils / folds more forming hydrogen and ionic bonds
disulfide bridges form when two atoms of the Aa cysteine come close together (sulfur covalently bonds to other)

Question 10

describe the quaternary structure of a protein

Answer 10

proteins made from more than one polypeptide chain

Question 11

what’s the strongest bond that forms between the amino acids

Answer 11

disulfide bridges (covalent bond)

Question 12

describe biuret test for proteins

Answer 12

• make sample alkaline by adding few drops of sodium hydroxide
• add copper II sulfate solution
  if present > turns purple
  if not > stays blue