Virology chapter 1

What is a virus?

An obligate, intercellular parasite surrounded by a protein coat

What type of organism do viruses infect?

virtually all types of organisms

What is virus in lattin?

Poison

Why are viruses nonliving?

They require a living host to reproduce

How are viruses replicated? (3 ways)

1. use host protein synthesis

2. Do not use Binary fussion and use available material

3. located at host site not seperated from cells

What level of magnification is needed to see viruses?

Electron Microscopes

WHat strands do Viruses use?

They use either RNA or DNA, they do not use both.

Who first vaccinated people against viruses?

Jenner

Who mde the first curative vaccine for rabies virus?

Pasture

Who is the father of virology?

Martinus Beijerinck

What is the organization that names and taxonomies viruses?

ICTV: International Committee on Taxonomy of Viruses

What are used to taxify viruses?

1. based on host(s)

2. Genetic compostion (SS, DS, DNA, RNA)

3. Morphology (shape)

4. Biology (range)

What do plant viruses use to infect?

Host plant RNA typically

What are the type of strands for viruses?

Single strand or double strand encased in protein

Who demonstrated mechanical transmission of viruses?

Mayer

Who showed viruses were smaller than bacteria via a wax filter?

Iwanowski

What allowed us to see the structure of viruses?

Crystalization of tobacco mosaic virus

What family infects plants and people? plants?

Bunyaviadae (ssRNA-), Clostiovirade (ssRNA+)

What is the size range for viruses?

30-450 nm

Size of polio

35 nm