VIRUSES AND PROKARYOTES Page 510 520 COMPARING UNICELLULARS

VIRUSES AND PROKARYOTES Page 510 -520

COMPARING UNICELLULARS VIRUS Size (from smallest to largest) Living or non-living Type of genetic material Organisms affected VIROID PRION BACTERIA

Answers VIRUS VIROID PRION BACTERIA Size (from smallest to largest) 3 2 1 4 Living or non-living Non Non Living DNA/RNA protein DNA all living plants proteins all living Type of genetic material Organisms affected

VIRUS STRUCTURE

PINKEYE (conjunctivitis)

TYPES • Virus are not named by the Linnaean classification system. • Instead, the nucleid acid type and their expression type are used. • They are given families and orders, but these do not represent phylogenies.

RECOMENDATIONS

DISEASES CAUSED BY VIRUS • Influenza • SARs • HIV • Chicken pox • Ebola • Hepatitis A • Rabies • Common cold

VIRAL INFECTION PATHWAY

The viral DNA forms a circle. The viral DNA forms a prophage by combining with the host´s cells DNA. The viral DNA directs the host cell to produce new viral parts that assemble into new bacteriophages. The prophage replicates along with the host cell´s DNA. The host bacterium breaks apart and bacteriophages are able to infect new host cells. Many cell divisions produce a colony of cells infected with the virus. The virus destroys the host cell. The prophage may leave the host´s DNA and enter the lytic cycle or may continue to incubate in the host´s cell.