DNA damage and repair

Any change in the sequence of DNA is...

• transgenic shift
• Single Genotype
• Monohybrid Trait
• Mutation

Tags

NGSS.HS-LS3-2

What is the correct definition of excision repair?

• a) Repair of a single damaged nucleotide

• b) Repair of a damaged oligonucleotide

• c) Removal of a single damaged nucleotide

• d) Removal of a damaged oligonucleotid

How many types of excision repair systems are known?

• a) 1

• b) 2

• c) 3

• d) 4

What is the main enzyme that plays the major role in formation of thymine dimer?

• a) DNA glycosylase

• b) DNA photolyase

• c) DNA gyrase

• d) DNA ligase

Two Thymines connected together by

• X-rays

• U- V light

• Infra Red

• Micro waves

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

DNA damage may be caused by

• Cellular metabolism

• U- V radiation

• Chemical exposure

• All of the above

Damage caused by U V radiation results in----

• Alkylation

• Dimer formation

• Creates linkage between opposite bases

• loss of purines

In mismatch repair process ----- is mismatch recognition enzyme

• Mut S

• Mut L

• Mut H

• Mut R

Tags

NGSS.HS-LS3-2

Bacteria can discriminate between old and new replicated strands

• True

• False

Which enzyme recognizes a damaged base and cleaves between the base and deoxyribose in the backbone in base excision repair ?

• AP endonuclease

• DNA polymerase

• DNA ligase

• DNA glycosylase