Set up Cornell notes in your IAN Notebooks to take notes on Viruses!!!

Answer the questions to this video as you watch! How does a virus attack? Answer the questions to this video as you watch!

Flu Attacks! Video Questions Complete the Flu Attacks! Video Worksheet with questions and a critical writing paragraph. Submit the finished worksheet in the Canvas Assignment

Characteristics of a Virus Not cells Non-living (can’t be treated with antibiotics) Change over time Very small Cause diseases – pathogen

Viruses DO NOT Grow (can’t get bigger) Metabolize nutrients (eat) Have a nucleus Have organelles Respond to stimuli Reproduce without a host - parasitic

Viruses are made of A protein coat called capsid DNA or RNA – but never both

Viruses also have Antigens – Glycoproteins on the capsid to recognize a target cell and bind to the receptor (fits like a key and lock)

Vaccines Inject a weakened virus Helps stimulate immune system to create antibodies against the virus Creates resistance to the virus Antibodies – proteins that attach to antigens keeping the immune system strong

A RETROVirus is A virus with RNA as its genetic material The RNA mutates easily by transcribing RNA backward Each individual virus created can be slightly different from the others (so hard for immune system to keep up with changes)

DRAW & LABEL the VIRUS below Bacteriophage (infects bacteria) Nucleic Acid Core CAPSID – made of a protein coat Antigen/Glycoprotein

Bacteriophage

DRAW & LABEL the VIRUS below HIV (Retrovirus RNA) Nucleic Acid Core (RNA) CAPSID – made of a protein coat Antigen (glycoprotein) Membrane Envelope (Made of lipids & glycoproteins)

HIV Virus

DRAW & LABEL the VIRUS below Influenza (Flu – Retrovirus RNA) Nucleic Acid Core CAPSID – made of a protein coat Antigen (glycoprotein) Membrane Envelope (Made of lipids & glycoproteins)

Influenza Virus

Viruses have a protein coat and genetic material.

How come we can not get the Tobacco Mosaic Virus? Viruses can only infect the host that they are intended for. The proteins on the surface of the virus fit the proteins on the surface of a host cell like this key fits this lock.

LYTIC CYCLE

Active Viruses Enter cell. Take over cell functions. Produces more viruses. Cell bursts releasing lots of new viruses. Those viruses infect more cells. The LYTIC CYCLE is SHORT! You can get the virus today, and be infected by tomorrow!

LYSOGENIC CYCLE

Hidden Viruses Enter cell. The Viruses genetic material becomes part of the cell genetic material. (It Hides!) The Virus is dormant for a long time. SUDDENLY, the dormant virus becomes active! It produces more viruses. Cell bursts releasing lots of new viruses. Those viruses infect more cells. The LYSOGENIC CYCLE is LONG! You can get the virus today, but not get sick for months or years!

between an active and hidden What is the difference between an active and hidden virus? The genetic material of a hidden virus can “hide” inside of the cell. It is undetected or hidden so the cell can not attack the virus! You can NEVER get rid of a hidden virus…EVER.