VirusesAnd

Bacteria

A look at our microscopic world Chapter 2

PointsTo

Remember

Active viruses can make you sick right awayViruses are much smaller than

Bacteria

Two types o

f viru

ses:

active and

hiddenViru

ses are classi

fied as non-liv

ing

Hidden viruses can survive for

hundreds of years before activating in

a new-found host

Genetic engineers can re-program viruses to deliver good DNA to help

sick people

Two main parts of a virus: The

Protein coat on the outside and the

DNA on the inside.

Antony van Leeuwenhoek (1632-1723)

Pronounced “ LAY vun hook”

Who was the first person to see and “discover” bacteria?

Some Bacteria

produce by Binary

Fission orAsexual

Reproduction

Some are Autotrophic. That means they feed

themselves

Other Bacteria

produce by Conjugation

orSexual

Reproduction

To survive harsh

conditions, Bacteria

formEndospores

Others are Heterotroph

ic. They need others for

food.

BACTERIA

BACTERIAHAVE FLAGELLA

OR A TAIL THEY USETO SWIM WITH

Names of Viruses

SmallpoxVirus

InfluenzaVirus

Cold Virus

Yellow FeverVirus

Cold SoreVirus

Bacteria in food can be killed with heat. This

process is called

Pasteurization.

Not all bacteriaare bad. Many are used

in foods like cheese,pickles, dried meat,

soy sauce, breadand many others .

Three shapes of Bacteria

Rodlike

Spherical

Spiral

Bacteria are natural

Decomposers.That is to say

they break down largechemicals into smaller

chemicals in dead organisms.