The development of vaccinations began when Edward Jenner noticed that ________
a. people who had earlier exposure to cowpox did not develop smallpox
b. people who drank water from a particular public water pump developed cholera
c. bacteria removed from a sick animal would cause the same illness if injected into a healthy animal
d. rats were always present when people contracted bubonic plague
a
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Target cells for steroid hormones and thyroid hormones do not have membrane receptors for these hormones because
they ____.
a. stimulate the cell by changes in electrical activity b. are hydrophobic c. enter the cell by ion channels d. are small enough to diffuse directly into the cell e. dissolve readily in the extracellular fluid (ECF)
Microbial Syntrophy cleans up oil!
What will be an ideal response?
The scientific name of humans is Homo sapiens. What is the genus of humans?
A. Homo B. sapiens C. Homo sapiens D. AnimaliaE. Eukarya
Reinforcement would eventually
A. reduce the formation of hybrids. B. increase the fitness of hybrids. C. favor and therefore increase the formation of hybrids. D. have no effect on hybrid formation.