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41 Cards in this Set

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Virus is the Latin word for __________?
poison
The size of a virus is 20 - 250 nm and must be seen with what type of microscope?
electron microscope
What do viruses use to reproduce new viruses?
host cells
Why are viruses not considered living?
1. don't grow
2. don't maintain homeostasis
3. don't metabolize
What are some infectious diseases caused by viruses?
mumps, smallpox, polio, influenza, rabies, chickenpox, hepatitis, common cold
When was the virus first discovered and what was it discovered in?
late 1800's affecting tobacco plants
What was the virus isolated by W. Stanley in 1935?
Tobacco mosaic virus
What are some ways to classify viruses?
1. RNA
2. DNA
3. Shape
4. Host
What is a virus which affects bacteria?
Bacteriophage
Packets of DNA or RNA are covered this this protein coat?
capid
What are harmful diseases called which are caused by viruses or bacteria?
pathogenic
In 1918 to 1919 how many died from the flu?
22 million
In order for a virus to reproduce new viruses it must use what kind of cell?
animal, plant, or bacterial
What is the approximate number of people infected with HIV world wide?
50 million
What is similar to a virus and causes proteins to change shape and not allow normal protein function?
Prions
What is a good example of a disease caused by What?
prions
What are the centers of DNA or RNA segments?
nucleic acids
What are viruses probably linked to?
some brain cancers
breast cancers
depression
What are single strands of RNA called?
Viroids
What do viroids mainly affect?
plants
What cells does HIV attack and destroy?
helpter T
What can happen when a proteins' shape is abnormal?
1. cells may malfunction
2. may cause disease
3. body chemistry may not work properly
Who is a person employed by hospitals, health departments, and universities to study human health and disease, and how the disease spreads?
Epidemiologist
What are an example of retroviruses?
influenza, rabies HIV,
What is the covers the nucleic acid of a virus?
capsid
What does HIV stand for?
Human immunodeficiency Virus
Before HIV is able to attach itself to a host blood cell, the surface proteins on the HIV must first recognize these proteins on the blood cell?
receptor proteins
What is the age group of the new infections of HIV in the U.S.?
Under 25
Aids is an example of an opportunistic disease because it strikes whom?
Those with a weak immune system
What does HIV stand for?
human immunodeficiency virus
What are two opportunistic diseases that AIDS victims may suffer or die from?
cancer pneumonia
What are two reasons why a virus is not considered to be alive?
1. do not grow
2. do not metabolize
3. do not maintain homeostasis
What is a virus or bacteria which causes a disease called?
pathogenic
Who is a person who studies how diseases are spread in a community?
Epidemiologist
What does HIV stand for?
human immunodeficiency virus
What are two opportunistic diseases that AIDS victims may suffer or die from?
cancer pneumonia
What are two reasons why a virus is not considered to be alive?
1. do not grow
2. do not metabolize
3. do not maintain homeostasis
What is a virus or bacteria which causes a disease called?
pathogenic
Who is a person who studies how diseases are spread in a community?
Epidemiologist
What are two ways to classify a virus?
1. Shape or RNA
2 Host or DNA
What must surface proteins on the HIV recognize on the blood in order for HIV to attach itself to a host blood cell?
RECEPTOR proteins