Protein

Question 1

Name the monomer that proteins area made from

Answer 1

amino acids

Question 2

Describe the general structure of amino acid

Answer 2

R
h2n - C- COOH
H

NH2= amine group
COOH = carboxyl group
R = carbon containing side chain

Question 3

Name the bond formed between 2 amino acids

Answer 3

peptide bond

Question 4

amino acid + amino acid =

Answer 4

dipeptide

Question 5

dipeptide + dipeptide =

Answer 5

polypeptide

Question 6

Name the protein test

Answer 6

biuret test

Question 7

Describe the biuret test

Answer 7

Add biuret solution violet if protein present

Question 8

Describe the primary structure

Answer 8

sequence of amino acids (order is important)

determines ultimate shape and its function

Question 9

Describe the secondary structure

Answer 9

interaction between the H from NH ( + ) O from CO group (-)

Alpha helix
Beta pleated sheet

Question 10

Describe the tertiary structure

Answer 10

3D structure
Disulphide bridges= strong between cysteine aa
Ionic bond= between carboxyl and amino acid group not involved in forming peptide bonds
Hydrogen bonds= numerous yet easily broken

Question 11

Describe the quaternary structure

Answer 11

individual chains come together ( includes prothetic group)
fibrous protein = structure ( think cellulose)
globular protein= metabolic functions

Question 12

How many naturally occurring amino acids are there?

Answer 12

20

Question 13

What changes from amino acid to amino acid?

Answer 13

the side chain is the only thing that changes