virus and bacteria - north palos school district …...virus & bacteria 0212 27 3. small rounded...
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Name: _________________ Period:____________
VIRUS AND BACTERIA
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VIRUSES Page 210 in the text for reference
So how large is a cell?
Characteristics
Tiny (smaller than cells)
Non living ????
Multiply or replicate (copy)
Does NOT reproduce!
Replicates inside a HOST
PARASITE because it Destroys the
host!
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Structure of Viruses
1. Bacteriophage
MEANS TO EAT
This virus “eats” (INFECTS)
Bacteria
.
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2. Tobacco Mosaic Virus
Infects plants
3. Influenza virus
Outer
membrane
proteins
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OF A VIRUS
PROTEIN COAT (CAPSID)
Functions for protection and
enables the virus to enter the
host cell
Inner core of genetic material
(DNA OR RNA)
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Virus proteins fit into only CERTAIN
membrane (cell) proteins
This is called LOCK AND KEY THEORY
Example: a cold virus infects
cells in the respiratory system
and not the digestive system
http://video.pbs.org/video/1487943618/ 1918 flu
AKA INFECTION
VIRAL MULTIPLICATION
Viruses DO NOT reproduce!! They only
multiply
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Both types use HOST CELLS
Host cells:
Cells that provide a source of energy for a virus
types of viral infection (multiplication)
LYTIC
(ACTIVE)
KEY WORD:
QUICK
LYSOGENIC
(HIDDEN)
KEY WORD:
INCORPORATES GENETIC MATERIAL...
SLOWER
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1. LYTIC CYCLE (ACTIVE INFECTION)
(www.PHSchool.com web code cep-1021)
Follows this sequence:
1.Attachment, 2.injection,
3.production, 4.assembly, 5. release
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YTIC
INFECTION
LYTIC INFECTION CYCLE
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2. LYSOGENIC CYCLE (HIDDEN INFECTION)
Follows this sequence:
1.Attach, 2.inject, 3.absorbs/incorporates,
4.separation, 5.production/assembly, 6.release
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Virus is INACTIVE
Separation occurs due
to a “trigger”
VIRUS IS NOW ACTIVE!
Notice where the
virus’s genetic material
is!!! **IMPORTANT**
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RELEASE OF
NEW VIRUSES!
***VIRUSES MULTIPLY AND REPLICATE
THEY DO NOT REPRODUCE!!!***
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1. Example of LYSOGENIC Virus: Cold
sores, HIV/AIDS,
Lysogenic Infection cycle
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Direct Contact with contaminated
objects
Bites of infected animals
example: rabies
Airborn (tiny
droplets)
Contact with body
fluids
Example: Aids & Hepetitis
Viruses and Disease
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NO TREATMENT for most viruses
The only “treatment” is REST,
EATING BALANCED DIET, AND DRINK
FLUIDS to help with symptoms
Some Anti-viral medication now.
Ex: Tamiflu
Vaccines
Good nutrition, exercise and SLEEP!
Hand washing
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. PROKARYOTE
NO DEFINED
NUCLEUS
Genetic material (DNA) is a
tangled mass (no nuclear
membrane!)
Has cell wall
Has cell membrane
Cytoplasm
Pili (for attachment)
Flagella (or Flagellum)
For movement or locomotion
BACTERIA CELL
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If no flagellum then movement occurs
by being carried from place to place.
Bacteria can be carried by
–Air
-H2O
-Animals or objects
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Shape (both individual and groups)
Size
Mode of nutrition
Respiration
1. Round
(spherical)
Called:COCCUS
(Cocci)--plural
Causes: Strep throat
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(Streptococcus)
2. Rod
Called: BACILLUS
(Bacilli)—plural
3. Spiral
Called: Spirillum (can be loose or tight
corkscrew shape)
4. Group shape
PAIRS= prefix “Diplo” (2)
2 coccus together =Diplococci
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2 round
2 bacillus together= Diplobacilli
2 rods
CHAINS= prefix “Strepto”
Chains of cocci = Streptococci
Chains of bacilli= Streptobacilli
CLUSTERS= Prefix “Staphlo”
(like grapes)
Only in cocci
Example: Staphlococci
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Staphlococcus aureus
2.
3. 0.5 to 1 micrometer
4. Micrometer = 1/millionth of a meter
3
Autotrophs
Some use the sun
Some use Chemical Energy from
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their environment
Some release O2 into the
atmosphere
Ex: cyanobacteria
Heterotrophs
Consume other organisms
Consume the food that other
organisms make
Example: milk, meat, & yogurt
AEROBES
These organisms NEED O2 to
break down food
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ANAEROBES
These organisms do NOT need O2
to break down food
These bacteria DIE if O2 is
present
Reproduction
Asexual
Binary Fission
Sexual
Conjugation
Reproduction of Bacteria
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Under the right conditions
(temperature, and plenty of food)
bacteria THRIVE and reproduce Population doubles every 20
minutes!
1.
BINARY FISSION
One parent; Offspring identical
Cell duplicates genetic
material and then divides
into 2 separate daughter
cells
Binary fission
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2.
CONJUGATION
Two parents; results in NEW
COMBINATION of genetic
material
One bacterium
TRANSFERS genetic
material to another
bacterium using a
THREAD LIKE BRIDGE
Does NOT
increase the number of
bacteria Bacterial conjugation
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3.
Small rounded thick walled
resting cell that forms inside
a bacterial cell
Occurs when conditions are
not optimal (good)
Allows bacteria to Survive
heat, freezing, and drying
Endospores can be carried
by the wind to allow for
spreading of bacteria
Bacterial endospores
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1. Cyanobacteria (Earth’s atmosphere)
2.
Yogurt & cheese
Definiton:
Pasteurization: heating food to a temperature
high enough to kill bacteria but not harm food
USES FOR BACTERIA
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3.
Bacteria break down LARGE
chemicals in dead organisms into
SMALLER chemicals
o Composting
o Nitrogen fixing bacteria
(Remember the Nitrogen Cycle??)
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4.
Bacteria that eat oil etc.
5.
o Insulin
o Normally occurring bacteria in the
Body (E.coli etc.)