Genetics of Viruses

Question 1

Virus

Answer 1

Small infection particle that consist of one or more nucleic acid molecule enclosed in a protein coat

Question 2

Host Cell

Answer 2

A cell that is infected by a virus

Question 3

Host Range

Answer 3

Number of different species & cell types they can infect (Ex. like only being able to infect lung cells)

Question 4

All viruses have a protein coat called ________

Answer 4

Capsid

Question 5

Caspid

Answer 5

Encloses a genome consisting of one or more types of protein subunits called capsomers

Question 6

Viral Genome

Answer 6

Genetic Material in a virus where it can be either DNA or RNA

Question 7

Virual reproductive cycle

Answer 7

Results in the production of new viruses

Question 8

What are the steps for viral reproductive cycle?

Answer 8

1. Attachment
2. Entry
3. Integration
4. Synthesis of viral components
5. Viral Assembly
6. Release

Question 9

Attachment

Answer 9

The virus attaches to the surface of the host cell (1st step)

Question 10

Entry

Answer 10

After attachment the viral genome (either DNA or RNA) enters the host cell (2nd step)

Question 11

Integration

Answer 11

Viruses contain an enzyme called integrase which cus the hosts chromsomal DNA & inserts the viral geneome (either RNA or DNA) into the chromosome (3rd step)

Question 12

Prophage

Answer 12

When the chromosome DN is intergrated

Question 13

Lysogenetic Cycle

Answer 13

The viral reproductive cycle when the phage DNA is a prophage

Question 14

Reverse Transscriptase

Answer 14

An enzyme that can turn a viral RNA into DNA

Question 15

Provirus

Answer 15

When a viral RNA is turn into viral DNA & the viral DNA is inserted into the host cell via integrate

Question 16

Synthesis of viral compenents

Answer 16

The production of new virsues by a host cell involves the replication of the viral genome & the synthesis of virall proteins that make up the capsid

Question 17

Viral Assembly

Answer 17

After all the necessary components have been synthesizedthey assembly into new viruses

Question 18

Released

Answer 18

Last step where the new viruses are released

Question 19

Latent Virus

Answer 19

An inactive virus

Question 20

Lysogeny

Answer 20

Latency in bacteriophage

Question 21

_____________ can cwitch betwen lysogenic & lytic cycle

Answer 21

Temperate phage

Question 22

______________ can only follow the lytic cycle

Answer 22

Virulant phages

Question 23

Episome

Answer 23

A genetic element that can replicate independently of the chromosomal DNA but can also integrate into chromsome DNA