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CH. 9 SEC 1 VIRUSES WHAT IS A VIRUS? VIRUS- IS A TINY, NONLIVING PARTICLE THAT INVADES AND MULTIPLIES INSIDE A LIVING CELL. KEY- THEY DO NOT HAVE CHARACTERISTICS.

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Presentation on theme: "CH. 9 SEC 1 VIRUSES WHAT IS A VIRUS? VIRUS- IS A TINY, NONLIVING PARTICLE THAT INVADES AND MULTIPLIES INSIDE A LIVING CELL. KEY- THEY DO NOT HAVE CHARACTERISTICS."— Presentation transcript:

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2 CH. 9 SEC 1 VIRUSES

3 WHAT IS A VIRUS? 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

4 CONT’D 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.

5 CONT’D 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

6 KEY- VIRUSES COME IN ALL SHAPES

7 STRUCTURE OF A VIRUS 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.

8 CONT’D 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

9 HOW VIRUSES MULTIPLY 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

10 HOW VIRUSES MULTIPLY 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

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12 ACTIVE VS HIDDEN VIRUSES 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!

13 VIRUS AND DISEASE 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

14 WHAT TO DO…… KEY- 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

15 WHAT TO DO…. KEY- YOU CAN ALSO PROTECT YOURSELF BY WASHING YOUR HANDS WITH SOAP AND WATER, RUNNING THE MILE, AND NOT SHARING EATING OR DRINKING UTENSILS. oGNMaA oGNMaA

16 COMPLETE WORKBOOK CH 9 SEC 1


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