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.

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 OF LIVING ORGANISMS

KEY- THE ONLY WAY IN WHICH VIRUSES ARE LIKE LIVING ORGANISMS IS THAT THEY CAN MULTIPLY

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.

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

KEY- VIRUSES COME IN ALL SHAPES

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.

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

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

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

http://www.youtube.com/watch?v=nfc46NpJ4Y8 http://www.youtube.com/watch?v=Rpj0emEGShQ

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!

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

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

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.

http://www.youtube.com/watch?v=s_yR-oGNMaA

COMPLETE WORKBOOK CH 9

SEC 1