2. Mutagenic Agents

Question 1

Define mutagenic agent

Answer 1

Increase the rate of mutation occurring

UvRadiation
Imposing radiation
Viruses

Question 2

Name 3 ways in which mutagens agents increase rate of mutations

Answer 2

1. Acting as a base
2. Altering bases
3. Changing structure of dna

Question 3

1. Acting as a base

Answer 3

Chemicals called base analogs can substitute for a base during dna replication

This changes the base sequence in new dna

Question 4

Example of acting as a base

Answer 4

5- bromouracil is a base analog that can substitute for thymine

Pairs with guanine ( not adenine ) causing substitution mutation in new dna

Question 5

2. Altering bases

Answer 5

Some chemicals delete or alter bases

Alkayating agents add alkyl group to guanine which changes the structure so that it pairs with thymine ( not cytosine )

Question 6

3. Changing the structure of dna

Answer 6

Radiation can change structure of dna causing problems with dna replication

Uv radiation can cause adjacent thymine bases to pair up