Which of the following statements about viral spikes is FALSE?
A) They are composed of carbohydrate-protein complexes.
B) They are used for attachment.
C) They may cause hemagglutination.
D) They bind to receptors on the host cell surface.
E) They are found only on nonenveloped viruses.
E
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An epidemic is
A. a disease that maintains a steady low-level frequency. B. a sudden increase in the occurrence of a disease above the expected level. C. a sudden unexpected occurrence of a disease in a limited segment of a population. D. when a disease occurs occasionally and at erratic intervals in the human population.
A rapid, powerful movement of short duration that could not be sustained very long would likely involve mainly ____
a. fast anaerobic fibers b. fast aerobic and fast anaerobic muscle fibers c. slow muscle fibers and fast aerobic muscle fibers d. slow muscle fibers e. fast aerobic fibers
Which of the following statements about emerging viruses is false?
A. The stable genome of the SARS virus makes it an unlikely candidate for vaccine development. B. The emerging virus SARS is a coronavirus. C. Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%. D. Hantavirus, which causes a hemorrhagic-type fever, originates in deer mice. E. Emerging viruses are able to "jump" from one species to another.
Which of the following adversely affects the ozone layer?
A. Oil B. Plastics C. Chlorofluorocarbons D. Coal and natural gas E. Greenhouse gases