All of the following are visible through a compound (brightfield) light microscope EXCEPT a:
A. Bacterial cell
B. Human red blood cell
C. Virus
D. Tick
Ans: C. Virus
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Which of these five evolutionary forces is rare and usually not considered by population geneticists?
A. mutation B. selection C. non-random mating D. genetic drift E. immigration
During swallowing, the _____ covers the entrance to the larynx. This structure is identified and labeled as letter _____
in the above diagram.
a. epiglottis; E b. pharynx; B c. glottis; C d. epiglottis; C e. trachea; E
The concept of an ecosystem differs from that
of a community in that, unlike the community, the ecosystem includes the a. producers. b. decomposers. c. physical environmental factors. d. animals as well as the plants. e. parasites.
The main advantage of YAC (yeast artificial chromosome) over other vectors in cloning human genes
is that A. it is taken up more readily by recipient cells. B. it is larger. C. it is less likely to trigger rejection. D. it is made of human DNA. E. it has unique restriction sites.