Transcript ch. 9 sec 1 viruses goal/purpose

CH. 9 SEC 1
VIRUSES
GOAL/PURPOSE
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STUDENTS LEARNED THAT CELLS ARE
THE BUILDING BLOCKS OF LIFE.
NOW YOU WILL LEARN WHY VIRUSES
ARE NOT CONSIDERED TO BE LIVING
BUT SHARE SOME CHARACTERISTICS
OF LIVING ORGANISMS
WHAT IS A VIRUS?
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VIRUS- IS A TINY, NONLIVING PARTICLE THAT
INVADES AND MULTIPLIES INSIDE A LIVING
CELL.
KEY- THEY DO NOT HAVE CHARACTERISTICS
OF LIVING ORGANISMS
KEY- THE ONLY WAY IN WHICH VIRUSES ARE
LIKE LIVING ORGANISMS IS THAT THEY CAN
MULTIPLY
CONT’D
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KEY – NO ORGANISM IS SAFE FROM
VIRUSES
KEY- VIRUSES NEED A “HOST”
ORGANISM TO MULTIPLY
HOST- IS A LIVING THING THAT
PROVIDES A SOURCE OF ENERGY FOR
A VIRUS OR AN ORGANISM.
CONT’D
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KEY- ALL VIRUSES DESTROY THE
HOST CELL
KEY- VIRUSES ACT LIKE “PARASITES”
PARASITES- ORGANISMS THAT LIVE
ON OR IN A HOST AND CAUSE IT HARM
KEY- VIRUSES COME IN ALL
SHAPES
STRUCTURE OF A VIRUS
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KEY- VIRUSES ARE SMALLER THAN CELLS
KEY- SOME VIRUSES ATTACK BACTERIA
THEY ARE CALLED “BACTERIOPHAGE”
MEANS BACTERIA EATER
KEY- ALL VIRUSES HAVE TWO BASIC PARTS:
A PROTEIN COAT THAT PROTECTS THE
VIRUS AND AN INNER CORE MADE OF
GENETIC MATERIAL
SKETCH AND LABEL FIGURE 2 AT
THE BOTTOM PAGE 319.
CONT’D
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KEY- EACH VIRUS CONTAINS UNIQUE
SURFACE PROTEINS
KEY- SHAPE OF THE SURFACE PROTEINS
ALLOW THE VIRUS ONLY TO ATTACH ONLY
TO CERTAIN CELLS. THINK “KEYS AND
LOCKS”
EXAMPLE- MOST COLD VIRUSES INFECT
CELLS ONLY IN THE NOSE AND THROAT OF
HUMANS
HOW VIRUSES MULTIPLY
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KEY- A VIRUS ATTACHES ITSELF TO A
HOST CELL
KEY- THE VIRUS INJECTS ITS GENETIC
MATERIAL INTO THE HOST CELL
KEY- ONCE INSIDE THE CELL, A
VIRUS'S GENETIC MATERIAL TAKES
OVER THE CELLS FUNCTIONS
HOW VIRUSES MULTIPLY
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KEY- THE VIRUS INSTRUCTS THE CELL TO
PRODUCE THE VIRUS’S PROTEINS AND
GENETIC MATERIAL.
KEY- THESE PROTEINS AND GENETIC
MATERIAL THEN ASSEMBLE INTO NEW
VIRUSES
http://www.youtube.com/watch?v=nfc46NpJ4Y8
http://www.youtube.com/watch?v=Rpj0emEGShQ
ACTIVE VS HIDDEN VIRUSES
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KEY- ACTIVE VIRUSES IMMEDIATELY
GO INTO A CELL AND START WORKING
TO PRODUCE MORE OF THE VIRUS
KEY- HIDDEN VIRUSES DO NOT
IMMEDIATELY BECOME ACTIVE. THE
VIRUS DOES NOT APPEAR TO AFFECT
THE CELLS FUNCTIONS UNTIL THE
RIGHT CONDITIONS MAKE IT ACTIVE.
SOME CAN STAY HIDDEN FOR YEARS!
VIRUS AND DISEASE
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VIRUS – CAN BE A Cold OR FLU BUT USUALLY
YOU ARE SICK FOR A SHORT TIME THEN
RECOVER
KEY- THEY CAN BE SPREAD THROUGH
OBJECTS, ANIMALS, SNEEZES AND COUGHS,
AND BODILY FLUIDS
KEY- THERE ARE CURRENTLY NO CURES
FOR VIRUSES SOME MEDICATIONS WILL
RELIEVE SOME SYMPTOMS
WHAT TO DO……
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RESTING, DRINKING
PLENTY OF FLUIDS, AND
EATING A WELL-BALANCED
MEALS MAY BE ALL YOU CAN
DO WHILE TRYING TO
RECOVER FROM A VIRAL
DISEASE
WHAT TO DO….
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KEY- YOU CAN ALSO PROTECT
YOURSELF BY WASHING YOUR HANDS
WITH SOAP AND WATER, RUNNING
THE MILE, AND NOT SHARING
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EATING OR DRINKING UTENSILS.
http://www.youtube.com/watch?v=s_yRoGNMaA
COMPLETE Q AND A
P.323
1-ABC
2-AB
3-A
4-AB