What did Jonas Salk's polio vaccine experiment find?
A) Vaccines could be developed from bacteria.
B) Vaccines were safe only for the elderly.
C) Inactivated viruses can be used as vaccines.
D) Polio could not be prevented with a vaccine.
C
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Why would antimicrobials that have toxic side effects be used at all (select the BEST reason)?
A. We want the largest possible number of choices of drugs in case a microbe shows resistance. With more possible weapons (even toxic ones), we have greater ability to eliminate infections. B. Every person is different. What is toxic to one person may not be toxic to another person. To eliminate a useful drug because it's toxic to 1% of people treated is a waste. C. Depending on the location of the infection, we may have no choice but to utilize a drug that has some toxic side effects to the patient. D. They shouldn't be used. We have enough of a selection of drugs that we can always select a drug with no toxicity. Drugs with toxicity are simply leftovers-relics from a time when we didn't have as many drug options.
The process of ____ is the transfer of heat from a body to a fluid that passes over its surface
a. conduction b. radiation c. evaporation d. convection e. radiative cooling
An ?OH group is a(n) ____ group
a. carboxyl b. hydroxyl c. amine d. methyl e. carbonyl
Which of the following terms describes the measure of members of a single species in a habitat against all organisms within the same area?
a. community diversity b. absolute species abundance c. relative species abundance d. community richness