3/8 PL Quiz

Question 1

What is ultraviolet radiation

Answer 1

A type of electromagnetic energy

Question 2

This is the distance between adjacent crests and is typically measured in nanometers

Answer 2

Wavelength

Question 3

What is the wavelength from 315-400

Answer 3

UV-A

Question 4

What is the wavelength between 280 and 315

Answer 4

UV-B

Question 5

Wavelength from 100-280 nm

Answer 5

UV-C

Question 6

What type of wavelength is the most detrimental to bacteria, exposure to it for more than a few minutes usually results in irreparable damage

Answer 6

UV-C

Question 7

What is the germicidal effect of UV-C related to time of

Answer 7

Exposure, lamp intensity, and distance to the target

Question 8

What is the effectiveness of UV diminished by

Answer 8

Dust

Question 9

What can be lethal to cells

Answer 9

Prolonged exposure to ultraviolet radiation

Question 10

What are the three pyramidine dimers

Answer 10

Cytosine-cytosine, cytosine-thymine, and thymine-thymine

Question 11

Why is prolonged exposure lethal

Answer 11

When DNA absorbs UV radiation the energy is used to form new covalent bonds between adjacent pyrimidines

Question 12

What do the dimers do

Answer 12

Distort the DNA molecule and interfere with DNA replication and transcription

Question 13

What is light repair

Answer 13

Photoreactivation

Question 14

What is the repair enzyme

Answer 14

DNA photolyase

Question 15

What is another word for excision repair

Answer 15

Dark repair

Question 16

What does the endonuclease do

Answer 16

Breaks two bonds

Question 17

Order of excision

Answer 17

Endonuclease, helicase, DNA polymerase 1, DNA ligase

Question 18

Why can ultraviolet radiation be used in decontamination

Answer 18

Cuz it had a lethal effect on bacterial cells