Virus vs. Bacterium MT: Immune System Vs.

Characteristics of a Virus 3 different shapes (spherical, rod, icosahedral) microscopic; 1/100 size of bacterium Has genetic material (DNA or RNA) Surrounded by a protein coat called a capsid No nucleus Proteins on outside to communicate to other cells

3 Shapes of a Virus Spherical Icosahedral Rod

Guess their shape: adenovirus HIV T4 phage Chicken pox Herpes H1N1

Treatment of a Virus Antiviral drugs: can stop transcription of viral proteins Vaccine Wait for body to produce antibodies

Reproduction of a Virus Cannot reproduce without a host Uses a host cell to go through transcription and translation Lytic or Lysogenic cycles (next slide)

Lytic Cycle Lysogenic Cycle Virus inserts genes into cell’s genes Transcription/translation occurs in cell to make viral proteins Cell lyses (splits) and viruses released to infect other cells Lysogenic Cycle Cell can multiply and incorporate viral genes into new cells Viral genes stay dormant in new cells but change in environment can cause lytic cycle to begin

Lytic CyCLE Lysogenic CyCLE

Shapes of a Bacterium 100 x bigger than virus 3 different shapes cocci (spherical) bacilli (rod), spirilla (spiral)

Guess their shape: Salmonella E. Coli streptococcus

Characteristics of a Bacterium No nucleus Genetic material (DNA or RNA) floats in cytoplasm Have a cell wall May have flagella to move around Proteins on outside to communicate with other cells

Treatment of Bacteria Antibiotic drugs: destroy the cell membrane of bacterium

Reproduction of Bacteria Binary Fission: making a clone Conjugation: tube from one bacterium inserts genes into other bacterium Spores: tiny dormant seeds

C/C Virus v. Bacterium using: Shapes Genetic material Size Contents inside Protection from outside How communicate with other cells