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Flashcards in HIV Deck (11)
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1

What does HIV stand for

human immunodeficiency virus

2

What does the HIV cause

AIDS (acquired immune deficiency syndrome)

3

Draw the structure of HIV

See pg 119 textbook

4

What organelle does HIV have (6 points)

1) lipid envelope
2) attachment proteins
3) matrix
4) capsid
5) genetic material (RNA)
6) reverse transcriptase (enzyme)

5

What group of viruses does HIV belong to

retroviruses

6

How does HIV replicate

uses its genetic material to instruct the host cell's biochemical mechanisms to produce the components required to make new HIV

7

What are the steps of HIV replication (8 points)

1) HIV enters the bloodstream and circulates around the body
2) protein on HIV binds to protein CD4 T-helper cell
3) protein capsid fuses with cell-surface membrane and the RNA & enzymes of HIV enter T-helper cell
4) HIV reverse transcriptase converts the virus's RNA into DNA
5) this DNA is moved into T-helper cells nucleus where it is inserted into the cells DNA
6) the HIV DNA in the nucleus creates mRNA using the cells enzymes, which contains instructions for making new viral proteins and the RNA to go into the new HIV
7) mRNA passes out of nucleus through nuclear pore and uses the cells protein synthesis mechanisms to make HIV particles
8) HIV particles break away from T-helper cells with a piece of the cell-surface membrane, that forms their lipid envelope

8

What does a person become when infected with HIV

HIV positive

9

Does a HIV positive person automatically have AIDS and why

no, because it often lies dormant so AIDS is only formed when it recommences many years later

10

What does HIV attack

T-helper cells

11

What does HIV mean for the number ofT-helper cells

it decreases them from 800-1200 in each mm3 to 200mm3