Which of the following are found in the nucleus of an atom?
A) protons and neutrons
B) neutrons
C) protons
D) electrons
E) protons, neutrons, and electrons
Answer: A
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Edward Jenner was able to protect people from contracting smallpox by injecting them with material from cowpox pustules because
a. both smallpox and cowpox are caused by the same virus, which causes a less severe disease in cows. b. antibodies against cowpox virus antigens can bind to similar proteins on the coat of smallpox virus. c. the injected fluid activated the nonspecific immune response, guarding against any subsequent infection. d. the material from the pustule contained antibodies that the cow had produced to the viral coat proteins. e. the material from the pustules contained weakened smallpox virus.
Most of Earth's water resides in
A) the oceans. B) the polar ice caps and glaciers. C) freshwater lakes, ponds, rivers, and streams. D) groundwater.
Which of these groups is characterized by having no body cavity?
A) Cnidarians B) Annelids C) Arthropods D) Chordates E) Roundworms
Evidence that supports the theory of evolution is found in studies of:
A) organs that show similar functions. B) ancient manuscripts. C) blending inheritance. D) molecular biology.