W3-2 Virus intro

Question 1

Classification system we use for viruses

Answer 1

Baltimore Classification System

Question 2

What procedure do we use to count the number of virus particles present?

Answer 2

Plaque assay procedure

Question 3

4 parts of eukaryotic viruses

Answer 3

1. Nucleic acid
2. Capsid
3. Tegument (maybe)
4. Envelope (maybe)

Question 4

Name of extracellular form of virus

Answer 4

virion

Question 5

What is a naked virus?

Answer 5

Without tegument and envelope

Question 6

What is a virus that infects bacteria called?

Answer 6

bacteriophage

Question 7

Are bacteriophages naked or enveloped viruses?

Answer 7

naked

Question 8

Crick’s two biggest mistakes

Answer 8

1. taking credit from Franklin

2. central dogma of molecular biology

Question 9

5 steps of viral replication cycle

Answer 9

1. Attachment
2. Injection
3. Protein and NA synthesis
4. Assembly
5. Release/lysis

Question 10

Class I example

Answer 10

Herpesvirus (dsDNA)

uses host cell’s translation mechanism

Question 11

Class IV example

Answer 11

Picrornaviruses (poliovirus)

RNA (+) sense

Question 12

Class V example

Answer 12

Orthomyxoviruses (influenza)

ssRNA (-) sense

Question 13

Lysis vs. Lysogeny

Answer 13

Lysis: releases cell contents

Lysogeny: latent period in cell (not all have this)

Question 14

Danger of viruses and antibiotic resistance

Answer 14

Viruses may confer virulence factors to bacteria