1. Viruses

2. 1.What is a virus? 2. nonliving 2. they have an outer layer called a capsid 2. they contain DNA or RNA 3. never both

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5. 2. reproduction 3. lytic 4. short cycle 4. virus reproduces quickly 4. kills cell quickly 4. symptoms of infection appear within 4 days 4. examples: common cold and the flu

6. 3. lysogenic 4. virus inserts DNA into the cell’s DNA 4. the cell divides with the virus DNA in it 4. the virus goes dormant 4. when the virus becomes activated then it goes through the lytic cycle 4. examples – HIV, herpes, warts

7. 2. retroviruses 3. has RNA instead of DNA 3. example – HIV 2. prions 3. a protein that causes a disease 3. normal prions are a coil shape; mutations cause the prion to become misfolded 3. example – mad cow disease