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Bio 1610 Pittilleri > Viruses > Flashcards

Flashcards in Viruses Deck (9):

Structure of a Virus

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


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


What do viruses target?

Particular cells or cell types


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.


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


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.


Enterovirus D68

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


Ebola Virus

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


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.