Viruses Are they living things?!?.

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Presentation transcript:

Viruses Are they living things?!?

Review Which correctly identifies the organization of living things from least complex to most complex? A. Community, Organism, Cell, Atom B. Tissue, Ecosystem, Cell, Organ System C. Molecule, Tissue, Population, Community D. Atom, Organ, Community, Population

Review What 8 characteristics define living things?

What do viruses look like? All Viruses Capsid DNA or RNA Some viruses Envelop

Comparison with a bacteria Made up of cells Get energy (metabolize) Respond to stimuli Reproduce asexually Evolve Virus Not a cell--no cell membrane, ribosomes No metabolism ?Response to stimuli? Reproduce using the cells machinery as a host Evolve

Bacteria vs. Viruses Bacteria can be treated with antibiotics that destroy the cell’s wall. Ex. Penicillin to get rid of Strep throat! Would antibiotics work on a sore throat caused by the common cold virus?

Virus Reproduction Lytic: Uses cell and destroys cell. Lysogenic: Uses cell and hangs out inside until the right time to strike!

Chicken Pox Varicella virus Lytic cycle--pox Lysogenic cycle--can remain dormant and come back as shingles. What does the vaccine do?

Vaccines Trick your immune system into producing a response to an antigen and make antibodies. Can be for a virus or bacteria.

What do antibodies do? Antibodies make it easier for your body’s immune system to recognize and destroy pathogens before you get “sick” “Memory”

Why vaccinate? Why not just treat the symptoms? If there is no host, the virus may no longer be able to exist. Smallpox was eradicated in 1977 through a world-wide vaccination program.

Types of Vaccines Live, attenuated Killed Component Toxins Chicken Pox MMR Polio “drink” Killed Flu Polio shot Component Hepatitis Toxins Tetanus DPT (whooping cough)

“Tricky” Vaccines Influenza-- HIV--Why don’t we have one? Why do we have to get a new one every year? Why doesn’t it always work? HIV--Why don’t we have one?

Virus Question Peer edit: How many characteristics of life did they mention? How many characteristics of life did they relate to the virus? How many characteristics of life did they explain using example from a virus why the virus does or does not display the characteristic? What could they add from what we talked about today to support 1-2 characteristics of life? What makes a good open response?