infection model

Infection Model
By
Dr. ali baay
Understand and describe a model of infection.

Understand the principles of classifying pathogens and to start to accumulate names and key characteristics of some common microbes.
Difinition of viruses


An infective agent that typically consists of a nucleic acid molecule( DNA or RNA) in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
Prokaryotes
are organisms without a cell nucleus & the genetic material present in non-organized structures (plasmid) & no any other membrane-bound organelles as nuclear membrane , microtubules , endoplasmic reticulum or mitochondria. Most are unicellular
Example bacteria & cyanobacteria

Eukaryotes are organisms whose cells are organized into complex structures by internal membranes and a cytoskeleton. The most characteristic membrane bound structure is the nucleus with distinct nuclear membrane & genetic material formed as chromosomes.
The cytoplasm contain all the organelles as mitochondria & ER.
Animals, plants, fungi, and protozoa are eukaryotes.
Non-calssified organisms : as they can not achieve the definition of any of the above mention definitions