Unit 2: Week 1 Round-Up (part 2)

Question 1

what are the four steps of animal virus replication via membrane fusion?

Answer 1

1. adsorption
2. membrane fusion
3. nucleocapsid released into cytoplasm
4. uncoating

Question 2

describe the first step of animal virus replication via membrane fusion?

Answer 2

adsorption. spikes attach to specific host cell receptors

Question 3

how do virions enter animal cells?

Answer 3

membrane fusion or endocytosis

Question 4

what are two ways that animal cells can die? generally speaking

Answer 4

• lysing
• immune system cells could kill them

Question 5

describe the second step of animal virus replication via membrane fusion

Answer 5

membrane fusion. envelope of virion fuses with plasma membrane

Question 6

describe the third step of animal virus replication via membrane fusion

Answer 6

nucleocapsid released into cytoplasm. viral envelope remains part of plasma membrane

Question 7

describe the fourth step of animal virus replication via membrane fusion

Answer 7

uncoating. nucleic acid separates from capsid.

Question 8

what are the two ways that animal viruses can enter an animal cell?

Answer 8

endocytosis, membrane fusion

Question 9

what are the four steps of animal virus replication via endocytosis

Answer 9

1. adsorption
2. endocytosis
3. release from vesicle
4. uncoating

Question 10

describe the first step of animal virus replication via endocytosis

Answer 10

adsorption. attachment to receptors triggers endocytosis

Question 11

describe the second step of animal virus replication via endocytosis

Answer 11

endocytosis. plasma membrane surrounds the virion, forming an endocytic vesicle

Question 12

describe the third step of animal virus replication via endocytosis

Answer 12

release from vesicle. envelope of virion fuses with the endosomal membrane

Question 13

describe the fourth step of animal virus replication via endocytosis

Answer 13

uncoating. nucleic acid separates from capsid