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21 SEP 12 24 SEP 12. VIRUSES. How did scientists come up with the term VIRUS?. In the 1890s, two scientists independently investigate the cause of the disease. How did scientists come up with the term VIRUS?.

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Presentation Transcript
slide2

How did scientists come up with the term VIRUS?

In the 1890s, two scientists independently investigate the cause of the disease.

slide3

How did scientists come up with the term VIRUS?

The scientists extracted sap from unhealthy leaves and put it on the leaves of normal, healthy plants

slide4

How did scientists come up with the term VIRUS?

They filtered the sap to remove bacteria and then repeated the tests.

slide5

How did scientists come up with the term VIRUS?

Their conclusion was that something smaller than bacteria were causing the disease.

slide6

VIRUS

Latin – Slime; poisonous liquid

Modern – Agent that causes infectious disease

slide8

What are the main components of a virus?

Capsid –

Protein Shell

Viruses are simple agents

Nucleic Acid Core

Envelope –

Outer Membrane

Surface Receptors

slide9

Capsids

PROTEINS

Isoleucine

Ile, I

Proline,

Pro, P

Asparagine, Asn, N

Threonine, Thr, T

Glutamic acid,

Glu, E

Serine, Ser, S

Amino Acids

slide10

Helical Viruses

Tobacco Mosaic Virus

slide12

Complex Viruses

T4

Bacteriophages

slide13

Influenza Virus

T4 Bacteriophage

Tobacco Mosaic Virus

RNA

DNA

Head

RNA

Capsid

Tail sheath

Tail fiber

Surface proteins

Capsid proteins

slide14

Nucleic Acid Core

DNA

Deoxyribonucleic acid

Adenine

Guanine

Thymine

Cytosine

slide15

Nucleic Acid Core

RNA

Ribonucleic acid

Adenine

Guanine

Uracil

Cytosine

slide16

Nucleic Acid Core

Viruses genomes can be either double stranded or single stranded.

slide17

Nucleic Acid Core

Viruses can only have one type of nucleic acid. It must be DNA or RNA, not both!

slide18

Envelope

Helps get the virus into the host cell.

slide19

Envelope

Acquired from the host cell.

slide20

Envelope

Is sensitive and can be disrupted by desiccation, heat, and exposure to detergents.

slide21

Receptors

Help the virus recognize the host cell.

slide22

Receptors

Are very specific – have a key and lock relationship.

slide23

Capsid

Protein Shell

Nucleic Acid

DNA or RNA

Envelope

Membrane around virus

Receptors

Proteins that help virus get into proper host