Biological molecules (PROTEINS)

Question 1

Describe the biuret test for proteins

Answer 1

1) Add sodium hydroxide to test solution
2) Add copper sulfate
Positive test result - solution turns from blue to lilac

Question 2

What monomer is the polymer protein formed from

Answer 2

Amino acids

Question 3

Describe the structure of amino acids

Answer 3

Horizontal: N-C-C
Attached to the N - two Hs
Attached to C - one R and one H
Attached to C - double bond O and another OH

Question 4

What makes up an amino acids

Answer 4

Amino group - H2N
Carboxyll group - COOH

Question 5

What does the R mean in an amino acid

Answer 5

Variable group

Question 6

What is a dipeptide

Answer 6

2 amino acids joined together via a condensation reaction

Question 7

What is a polypeptide

Answer 7

2 or more amino acids joined together via a condensation reaction

Question 8

What is the bond called between amino acids

Answer 8

Peptide bond - forms between the OH of carboxyll and H of amino group

Question 9

What are the 4 levels of proteins

Answer 9

Primary structure
Secondary structure
Tertiary structure
Quaternary structure

Question 10

What is the primary structure of a protein

Answer 10

The sequence of amino acids in the polypeptide chain

Question 11

Describe the secondary structure of a protein