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
-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.
-Enters through GI tract
-Found in respiratory secretions
-Cold/flu like symptoms
-Initially from wild animals, then human to human
-Targets some immune cells, cells lining the blood vessels, and liver cells.