Viruses Flashcards Preview

Bio 1610 Pittilleri > Viruses > Flashcards

Flashcards in Viruses Deck (9):
1

Structure of a Virus

-Protein Coat (some have a lipid envelope)
-Genetic Material (DNA or RNA)

2

Lytic Cycle Steps (Cell lysis)

1. Attachment to the membrane
2. Injection of DNA into the cell and degradation of Host DNA. - Viruses takeover and turn cells into a virus factory.
3. Cell Synthesizes viral genome and proteins
4. Assembly of new viruses
5. Cell Lysis and release of viruses

3

What do viruses target?

Particular cells or cell types

4

Lysogenic Cycle

-DNA doesn't take over cell, but stays dormant.
-Cell splits, now two cells have virus DNA and so on
-Eventually, the DNA is triggered and the cell enters the 3rd step of the lytic cycle.

5

Life cycle of viruses with lipid envelope.

-Lipid coat allows them to enter the cell
-Lipid envelope fuses with cell membrane, DNA infection, new viruses sent out via exocytosis.
--some viruses are harmful and some less so

6

Human Immunodeficiency Virus (HIV)

-transmitted through bodily fluid
--can't survive outside of bodily fluid
-targets CD4 cells (Helper T cells) of the immune system which helps to stimulate every other aspect of the immune system.

7

Enterovirus D68

-Enters through GI tract
-Found in respiratory secretions
-Cold/flu like symptoms

8

Ebola Virus

-Initially from wild animals, then human to human
-Targets some immune cells, cells lining the blood vessels, and liver cells.

9

Problems with viruses

-Not cells
--Cells provide targets for medications (membrane protein etc.) ,(which viruses don't have).
-Constantly Mutating
--medication works on one strain, but not another.