Lesson: Viruses and Germ Theory

Viruses

- non-living infectious particles

- use cells to reproduce and spread

- incredibly small

- structurally fairly simple

- each virus of a type is essentially the same

Basic Virus - Nulcleic Acid and Protein Coat

More complicated - also have a protein envelope

Bacteriophage - specifically infect bacteria, have an "alien" shape

Replication-

Lytic Cycle - viral nucleic acid and protein coat are manufactured by cell. So many are produced that the cell ruptures and the virus spreads

Lysogenic Cycle - viral nucleic acid "hides" in cell's DNA, cell reproduces. Later, the genes are turned on and it re-enters the lytic cycle

Disease Prevention:

Sanitation - keeping the environment clean (clean water, waste water)

Hygiene - keeping yourself clean

Aseptic techniques - washing surfaces, tools with disinfectants

Vaccine - use a dead/disable virus to stimulate immunity

Vaccine

Activities, Assignments, Etc.

Diagrams - Viral structure & reproduction

Assignment - Viral & Bacterial Diseases

p 511 (#1-2)

p512 (#1 see p467, graph #2 only table 2, 3, 5)

p517 (1,4)

p519 Analyze question at bottom of page

p520 (2-5)