Unit 7 Acellular Microbes

Non cellular, use cell to replicate

• "sub viruses"
• plant pathogens
• consist only of RNA - single stranded covalent circles
• stable

• infectious protein
• no genetic material

bacterial virus

protein coat which protects nucleic acid

capsid and nucleic acid

membrane surrounding some viruses

phage or virus attaches to cell

Process of the virus or viral nucleic acid getting into the cell

ligand is in the capsid of the virus

ligand is in the envelope of the virus

when virus infects cell and becomes dormant

• -chicken pox
• -shingles
• -herpes
• -HIV & AIDS
• -cold sores, genital sores

B & D

Have extra steps in b/t penetration and multiplication

Copy viral RNA to DNA (reverse transcription)

• Viruses that have defective viral genomes
• "parasitzes" another virus called the helper virus

multiple RNA segments that must all be packaged into a single virion to make an infectious virus

A virus with several genome segments that are packaged w/ 2-3 segments per virion

• equivalent to mRNA; immediately codes for protein upon entering the cells
• most are infections w/out any other viral proteins

• equivalent to DNA
• must first be copied into +RNA/mRNA to make a protein
• must enter cell w/ an RNA dependant RNA polymerase to make the +RNA infectious

• -obligate intracellular parasite
• -viral genome is either DNA or RNA
• -in host cell, virus uses the biochemical machinery of the host cell to make viral components
• -progeny virions are assembled from the viral components
• -virus has an extracellular infectious phase

A) True