Download Virus and Bacteria

MICROBIOLOGY
studies microscopic organisms (viruses,
bacteria, protists, parasites, & fungi)
all single-celled organisms.
infect the human body & cause disease.
DISEASE- ANY INTERUPTION OF YOUR
NORMAL BODY PROCESSES
VIRUSES
Microscopic particles that INVADE &
DESTROY healthy cells.
Extremely small (smaller than
bacteria)
Most widespread among humans
Needs a host cell .
VIRUSES
SPREAD THROUGH
HUMAN CONTACT
WATER
TOUCHING INFECTED SURFACES
INSECT BITES
VACCINES AND SOME ANTI VIRAL
DRUGS CAN HELP CONTROL THE
SPREAD OF VIRAL DISEASES
HOW VIRUSES REPRODUCE
THE LYTIC CYCLE
Is the cycle by which a virus
1. attaches itself to a host cell,
2. injects genetic material (DNA/RNA),
3. reproduces many times,
4. kills the cell
5. breaks out to start the cycle again.
VIRAL DISEASES
CAUSE MANY DISEASES IN HUMANS.
EXAMPLES: HIV (AIDS), COLD,
FLU(INFLUENZA), MONONUCLEOSIS, mild
fever, some forms of cancer
Viruses cannot be cured with
antibiotics.
some new anti-viral medications.
VACCINES HELP PREVENT AND
CONTROL THE SPREAD OF VIRUSES
ARE VIRUSES LIVING?
NOT ALIVE!!!! but do affect living
things.
They contain genetic material(DNA & RNA)
and protein (protein coat)
They cannot eat, grow, digest food, or use
oxygen.
They cannot function on their own. They
must live inside of a living cell (host cell).
Viruses are NOT alive.
Use enzymes & the healthy cells
organelles and to reproduce
A living thing that a virus or parasite
lives in is called a host.
SHAPES OF VIRUSES
Shapes: crystals, cylinders,
spheres, spacecraft
( GO TO PAGE 619 IN
TEXTBOOK AND DRAW THE FOUR
SHAPES OF VIRUSES)
Bacteria
BACTERIA
Single-celled, no nucleus (PROKARYOTE),
are the smallest LIVING organisms.
Are found everywhere: air, water, soil,
inside of your body and on your skin.
They multiply very rapidly under favorable
conditions & form colonies of millions of
cells.
BACTERIA
Can live in hot or cold temperature &
with or without oxygen
Reproduce by binary fission (asexual
reproduction)
BACTERIA
Are classified based on their shape
(3 types):
Draw and label in your
notes
BACTERIAL DISEASES
•LYME DISEASE
•BACTERIAL MENINGITIS
• LEPROSY
•SINUS INFECTION
•STREP THROAT
•TUBERCULOSIS
FIGHTING DISEASES
ANTIBIOTICS FIGHT BACTERIAL
DISEASES. (antibiotics can only kill living
organisms)

Stop bacteria from growing
VACCINES HELP TO PREVENT VIRAL
DISEASES
ANTIBIOTIC RESISTANCE
 Occurs when we overuse antibiotics.
 Some bacteria will survive and produce
new bacteria that resist antibiotics.
 This makes treating bacterial diseases
difficult when bacteria are not affected by
the antibiotic