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