Proteins

Question 1

What is a polymer of amino acids called?

Answer 1

A polypeptide chain

Question 2

Name the type of bond that joins two amino acids together

Answer 2

Peptide bond

Question 3

How many naturally occurring amino acids exist?

Answer 3

20

Question 4

List 4 different components that make up an amino acid

Answer 4

Carboxyl group, amino group, R group and central C and H.

Question 5

How many different R groups exist?

Answer 5

20

Question 6

Name the molecule produced when two amino acids join together

Answer 6

Dipeptide

Question 7

Name the reaction that joins two amino acids together

Answer 7

Condensation reaction

Question 8

Name two products that are formed when two amino acids join together

Answer 8

Dipeptide and water

Question 9

Name the type of reaction that break peptide bonds

Answer 9

Hydrolysis

Question 10

Define the primary structure of a protein

Answer 10

A polypeptide chain of amino acids held together by peptide bonds

Question 11

Name two types of folding that can occur in a secondary structure protein

Answer 11

Alpha helix and beta pleated sheets

Question 12

Name the type of bond that holds a secondary structure protein in position

Answer 12

Hydrogen

Question 13

Name 3 types of bond that can occur in a tertiary structure protein

Answer 13

Hydrogen
Ionic
Disulphide

Question 14

What can break Disulphide bonds

Answer 14

Reducing agents

Question 15

What can break ionic bonds?

Answer 15

Extremes of pH

Question 16

What can break hydrogen bonds?

Answer 16

Fluctuations in temperature and pH

Question 17

Give an example of a tertiary structure protein

Answer 17

Myoglobin

Question 18

Give an example of a quaternary structure protein

Answer 18

Haemoglobin

Question 19

Define a quaternary structure protein

Answer 19

A protein with more than one polypeptide chain

Question 20

What chemicals would you use to test for the presence of a protein?

Answer 20

Sodium hydroxide and copper sulphate solution

Question 21

What colour would indicate a positive test for protein?

Answer 21

Purple/lilac

Question 22

What colour would indicate a negative test for protein?

Answer 22

Blue

Question 23

Name the monomer that makes up a protein

Answer 23

Amino acid