viral phases of lifecycle

Question 1

1. adsoprtion

Answer 1

When a virus can invade its host cell only through making an exact fit with a specific host molecule

Question 2

Host range in adsoprtion
1.

Answer 2

the limited range of cells that a virus can infect:
Hepatitis B: liver cells of humans
Poliovirus: intestinal and nerve cells of primates
Rabies: various cells of all mammals

Question 3

Cells that lack compatible virus receptors are
1.

Answer 3

resistant to adsorption and invasion by that virus.

Question 4

What is tropism?
1.

Answer 4

specificities of viruses for certain tissues

Question 5

Step 2: Penetrating and uncoating Penetration through endocytosis happens when

Answer 5

an entire virus is engulfed by the cell and enclosed in a vacuole or vesicle.

Question 6

Direct penetration;Step 2: Penetrating and uncoating

Answer 6

fusion of the viral envelope with the cell membrane

Question 7

Step 2: Penetrating and uncoating

Enzymes in the vacuole dissolve the envelope and capsid.
Virus fuses with the wall of the vesicle.
Viral nucleic acid is released into the cytoplasm

Answer 7

uncoating

Question 8

synthesis and replication part 3:

Enter the host cell’s nucleus and are replicated and assembled there

Answer 8

DNA viruses:

Question 9

synthesis and replication part 3: : replicated and assembled in the cytoplasm

Answer 9

RNA

Question 10

synthesis and replication part 3: turn their RNA genomes into DNA.

Answer 10

Retroviruses

Question 11

Assembly and release: part 4: virus is put together using “parts” manufactured during the synthesis process.

Answer 11

Assembly:

Question 12

Assembly and release: part 4:

the number of viruses released by infected cells is variable, controlled by:
Size of the virus
Health of the host cell

Answer 12

Release

Question 13

The flexible cell membrane of the host is penetrated by the whole virus or its nucleic acid.: True or false?
Step 2

Answer 13

true