Which portion of the lymphatic system is the site where T lymphocytes develop?
a. tonsils
b. all lymph nodes
c. liver
d. thymus gland
e. thoracic duct
ANSWER: d
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The tendency of water molecules to form hydrogen bonds is
A. evaporation. B. hydrolysis. C. cohesion. D. condensation. E. adhesion.
In science, the word "theory" ____
a. is an explanation that has not been published b. has essentially the same meaning as a prediction c. is based mostly on opinions d. signifies that a hypothesis has been tested and proven over a period of time e. means that a scientist has a hunch something is true
Plants that produce scentless, inconspicuous flowers with enormous amounts of pollen are adapted to
which type of pollination? a. wind b. birds c. bats d. small rodents e. insects
What type of vaccine is the hepatitis B vaccine?
A) inactivated whole pathogen B) attenuated vaccine C) toxoid vaccine D) a recombinant vaccine composed of a single antigen of the hepatitis virus E) a vaccine produced by treating the virus with formaldehyde