Which type of brain waves are observed when a person is in deep sleep?
1.Alpha waves
2.Beta waves
3.Delta waves
4.Theta waves
3
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During spring time in Maine, male moose often enter a cow pasture and begin calling to the female cows. The moose may even try to mount the female but the male genitalia do not fit properly inside the female genitalia. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
The movement of water across a membrane from an area of high to low water concentration is an
example of ____.
a. active transport b. endocytosis c. osmosis d. both osmosis and active transport e. both diffusion and osmosis
At about how many weeks of pregnancy is a chorionic villus sampling performed?
a. eight b. ten c. fourteen d. sixteen e. twenty
MHC proteins
a. are always expressed on cell surfaces. b. have embedded peptides derived from breakdown products of cell metabolism. c. present peptide antigens to CLSs and Th cells. d. are described by all of the above.