Viruses!

Question 1

What is a virus?

Answer 1

1. non-cellular particle made up of either DNA or RNA and a protein coat 2. only function in a living cell 3. they are parasites 4. they are specific to the organism they infect

Question 2

Structure of a virus

Answer 2

Core: nucleic acid (DNA/ RNA) Protein coat (CAPSID) which surrounds DNA and helps trick the host cell to allow the virus to enter some have an envelope (p&a) which will chem. recognize the cells that they infect

Question 3

Examples of viruses

Answer 3

Bacteriophage- bacterial virus Influenza virus- animal virus

Question 4

Treating viruses

Answer 4

Antibiotics will NOT work, they will only kill bacteria, but you can treat the symptoms of a virus since your own antibodies have to ultimately get rid of it

Question 5

How are viruses are spread?

Answer 5

Physical contact, contaminated food and water, infected (ticks, mosquito…)

Question 6

Lytic cycle

Answer 6

lyse= to BURST, feel effects 24-48 hours later virus enters cell, makes copies of itself and causes cell to burst 1. attachment 2. injection (injects DNA to host cell, gets mixed in w/ host DNA) 3. Replication (takes over host’s metabolism, replicates viral DNA) 4. Assembly (cell makes new copies of the virus) 5. Cell death: Cell bursts open and releases viruses

Question 7

Lysogenic cycle

Answer 7

host cell DOESN’T die immediately begins the same as lytic cycle creates a provirus after viral DNA incorporated into host’s DNA, viral DNA remains “dormant” and replicates when the cells replicate (can go for many generations) viral DNA enters the lytic cycle and removes itself from host DNA