Exam 3 Ch. 6

Question 0

Virus

Answer 0

1. Infectious agent w/ simple acellular organization
2. No metabolism
3. Reproduce only w/in living host cell
4. Size 10-400 nm
5. Infect animals, plants, fungi, Archea, bacteria

Question 1

Virology

Answer 1

Study of viruses & other acellular agents

Question 2

Viruses have no ___

Answer 2

Metabolism

Question 3

Nucleocapsid

Answer 3

Protein coat + nucleic acid

Question 4

___ ____ encodes for protein coat

Answer 4

Nucleic acid

Question 5

Capsid

Answer 5

1. Protective protein coat
2. Aids in transfer of Nucleic Acid b/w host cells
3. Sub unit is capsomer which self assembles

Question 6

Spikes

Answer 6

Proteins projecting from envelope often used for attachment or release from host cell, some are enzymes

Question 7

Enveloped virus

Answer 7

Virus w/ a membrane surrounding nucleocapsid

Question 8

Non-enveloped/ Naked Virus

Answer 8

No envelope!

Question 9

Virion

Answer 9

Complete virus particle

Question 10

Bacteriophage

Answer 10

Virus that infects bacteria

Question 11

Plus/positive strand RNA

Answer 11

RNA genome identical to mRNA

Question 12

Minus/ negative strand RNA/ DNA

Answer 12

Genome complementary to mRNA

Question 13

Steps of Viral Multiplication

Answer 13

1. Adsorption
2. Entry into host cell
3. Synthesis
4. Assembly
5. Release

Question 14

Adsorption

Answer 14

Receptors on host cell bind to molecules on surface of vision

Question 15

Entry into host cell

Answer 15

Fusion w/ host cell membrane or by endocytosis or injection of nucleic acid

Question 16

Synthesis

Answer 16

Production of virus parts by host cell

Question 17

____ ____ usually take over host cell

Answer 17

Early proteins

Question 18

____ ____ usually responsible for capsid protein production, self assembly & release

Answer 18

Late proteins

Question 19

Assembly

Answer 19

Put together vision particles either in nucleus or cytoplasm

Question 20

Release

Answer 20

Budding or lysis of host cell

Question 21

Virulent phage

Answer 21

Immediately takes over host cell followed by release from host cell by lysis

Question 22

Temperate phage

Answer 22

Can either immediately take over & Lyse host cell or can remain in host cell w/out destroying it

Question 23

Lytic

Answer 23

Take over host cell & lyse

Question 24

Lysogenic

Answer 24

Phage DNA integrates into host cell chromosome & waits till induction occurs where phage DNA is triggered to come out by stress & then takes over host cell

Question 25

Lysogeny

Answer 25

Process of bacterial cell being infected by temperate phage & copying the phage every generation

Question 26

Archeal viruses can be either

Answer 26

Virulent or temperate

Question 27

Cytocidal effect

Answer 27

Results in cell death, lysis

Question 28

Cytopathic effects

Answer 28

Damage to host cell caused by viral replication/ synthesis/release like budding, viral inclusions, enlargement of cell, fusion of cells

Question 29

Oncogenic viruses

Answer 29

Viruses that cause cancer often by inactivating tumor-suppressor genes normally in host cell

Question 30

Plaques

Answer 30

Form when virus lyses host cells

Question 31

Viroids

Answer 31

1. Naked circular ssRNA

2. Use host cell DNA-dependent RNA polymerase to maked RNA copies

Question 32

Virusoids

Answer 32

1. Satellite
2. Closed circular ssRNAs
3. Have genes

Question 33

Prion

Answer 33

Proteinaceous infectious particle
Misfolded protein
Causes normal proteins to Misfold