Virus

Question 1

All viruses are

Answer 1

Obligate intracellular parasites

Question 2

2 animal viruses

Answer 2

1. Foot and Mouth disease- first animal disease

2. Yellow fever- first human virus

Question 3

Nucleocapsid

Answer 3

Repeating protein subunits called capsomeres
Core- dna/ rna
Capsid- protein coat

Question 4

Particle size range for virus

Answer 4

18 (30)-300 nm

Question 5

+ssRNA virus

Answer 5

Ready to be used to make a protein

Question 6

-ssRNA virus

Answer 6

RNA needs to be copied into +ssRNA, needs RNA deep RNA Polymerase

Question 7

Virus Replication steps

Answer 7

1. Attachment
2. Entry
3. Transcription
4. Translation
5. Replication
6. Assembly
7. Release

Question 8

Entry by 2 ways

Answer 8

1. Receptor mediated endocytosis

2. Direct penetration of Plasma membrane

Question 9

Nonenveloped viruses form

Answer 9

Pores/ disrupt the membrane

Question 10

Enveloped viruses

Answer 10

Membrane fusion

Question 11

Enveloped viruses cause a receptor conformation change by (2)

Answer 11

1. Low pH

2. Receptor induced

Question 12

HA protein in ______, which is an ______ virus is for ______

Answer 12

HA protein in influenza, which is an enveloped virus, is for Cell attachment and fusion

Question 13

Which genomes MUST bring their own polymerase into cell

Answer 13

-ssRNA and dsRNA

Question 14

DNA viruses rely on

Answer 14

Cellular RNA polymerase

Question 15

ALL _____ need cells ribosomes

Answer 15

viruses

Question 16

Release techniques (3)

Answer 16

Lysis
Weak lysis
Budding (only enveloped viruses)

Question 17

1 step growth curve

Answer 17

Infects every cell at same time and dies at same time

Question 18

Phases of the growth curve

Answer 18

1. Eclipse- attach and uptake
2. Exponential growth- replicate and assembly
3. Plateau- cell death

Question 19

Viruses are only alive when _______

Answer 19

In the cell

Question 20

All viruses are ___________

Answer 20

Obligate intracellular parasites

Question 21

Viruses are classified by 4

Answer 21

1. Genome
2. Structure
3. Particle
4. Replication