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Transcript
Viruses Viruses • Use infected cell to produce more viruses • Capsid: protein coat surrounding DNA/RNA core • bacteriophage – virus that infects bacteria Viral Infections Lytic Infection • after entering the cell, host cell make 1000’s of copies of viruse’s DNA • new virus particles are made • the infected cell then lyses, or busts • 100’s of virus particles are released Viral Infections Lysogenic Infection • Prophage: viral DNA become part of the host’s DNA • viral DNA is copies with host’s DNA • When the prophage is activated, the cell enters the lytic cycle Retroviruses • • • • RNA In host cell, makes a DNA copy of RNA its DNA is inserted into the host’s DNA AIDS Are Viruses Alive? • Not Alive – – – – no response to the environment does not obtain or use energy no growth or development reproduces only with a host cell
