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size of virus

much smaller than cell

What is a virus?

in general, viruses are obligate intracellular parasites (have to do it; life in a cell is harmful to cell; if not in a cell, virus tries to find a cell by whatever means to use, or abuse)


breaks down into DNA/RNA and could contain either single/double strand (lots of variation)


coat on virus and made of protein

phospholipid bilayer

some viruses have envelope on top of coating

bacterio phage

sterotypical virus; viruses are different, but they do all have a genome and coat

Lytic Cycle

where virus hijacks energy from cell by attaching, entry, synthesis, assembly, release


virus attaches and pierces onto cell


virus pierces into cell and drops [DNA] virus in

Role of restriction enzyme

if cells DNA has special enzyme, it will cut up virus [DNA] before the virus chops up the original DNA


DNA from host cell falls apart; abuses by building with proteins and other resources to make own parts

Result of Lytic Cycle

causes symptoms, which are a lot of dead cells not doing what they're supposed to do


viruses self-assemble


cell bursts with newly assembled viruses; then the cycle repeats because the viruses will now do the same thing to another cell

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