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Biology 11

Viruses

QuestionAnswer
Capsid Protein coat that covers viral nucleic acid (DNA, RNA)
Envelope Surrounds capsid and contains protein spikes to help attach to host (only in some viruses)
Tail Aid in attachment
Tail fibers Aid in attachment
Lytic cycle attachment, enzyme (breaks down host cell membrane, viral nucleic acid injected into cell, takes over. Host cell's DNA is inactive. Viral DNA copies and viral proteins are made. Viral proteins and nucleic acids made into new viruses-cell bursts open LYSIS
Lysogenic cycle same as lytic cycle except, viral nucleic acid becomes part of host cell DNA. Genes integrated into host replicated with host DNA. Many generations go by before virus affects cell. called LYSOGENY. after generations viral DNA takes over- w/lytic cycle
Difference between lytic + lysogenic cycle DNA is integrated in lysogenic cycle and virus does not produce new virus for a number of generations. Symptoms caused by a disease-causing lysogenic virus will not appear until later ex. HIV/AIDS
H.I.V. Human Immunodeficiency Virus.
Retrovirus shuts down your immune system, eventually causing death
Created by: ybot
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