proteins

Question 1

what are the monomers of proteins?

Answer 1

amino acids

Question 2

what is a dipeptide?

Answer 2

two amino acids joined together by a peptide bond

Question 3

what is the primary structure of a protein?

Answer 3

chain of amino acids

Question 4

what is the secondary structure of a protein?

Answer 4

chain becomes coiled

hydrogen bonds form between amino acids in the polypeptide chain

Question 5

what forms can the secondary structure take?

Answer 5

alpha helix
beta pleated sheet

Question 6

what is the tertiary structure of a protein?

Answer 6

3D
ionin, hydrogen, covalent bonds form
disulphide bridges form between cysteine molecules

Question 7

what is the quaternary structure of a protein?

Answer 7

lots of amino acid chains (polypeptide chains)

Question 8

what are 4 examples of functions for a protein?

Answer 8

enzymes
antibodies
transport proteins
structural proteins (keratin,collagen)

Question 9

how can the structure of an amino acid be written?

Answer 9

NH2CRHCOOH

Question 10

what are the groups on an amino acid?

Answer 10

amine group - NH2
R group
carboxyl group - COOH
another hydrogen attatched to the carbon

Question 11

what is the test for proteins?

Answer 11

biurets test

Question 12

outline the biurets test

Answer 12

add sample and add equal volume of sodium hydroxide ]
add a few drops of dilute copper (II) sulfate solution
purple colour indicates presence of a peptide bond