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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology