3.1.4 Proteins

Question 1

There are …different amino acids that can be used to form polypeptides

Answer 1

20

Question 2

A condensation reaction between 2 amino acids forms…

Answer 2

Dipeptide and water

Question 3

A condensation reaction between …amino acids forms a dipeptide and water

Answer 3

2

Question 4

A…reaction between 2 amino acids forms a dipeptide and water

Answer 4

Condensation

Question 5

A dipeptide and 1 molecule of water are hydrolysed to form…

Answer 5

2 amino acids

Question 6

Name for bond between 2 amino acids in dipeptide

Answer 6

Peptide bond

Question 7

During the condensation of 2 amino acids to form a dipeptide and water a …bond is formed between the 2 amino acids

Answer 7

Peptide

Question 8

H2N is known as the…group

Answer 8

Amine

Question 9

True or false, when drawing an amino acid the H must always go on the top and the R must always go on the bottom

Answer 9

False
The R and H can go either way round
But the amine group (H2N) must always go on the left and the carboxylic acid (COOH) must always go on the right

Question 10

The…group of the amino acid determines which amino acid it is

Answer 10

R
(The R group is variable as it can change but the rest of the amino acid never changes)

Question 11

Which part of the amino acid is variable so can change

Answer 11

R group
(The R group determines which amino acid it is)

Question 12

Dipeptides are formed by the condensation of…amino acids but polypeptides are formed by the condensation of many amino acids

Answer 12

2