Two populations that have been separated from each other for a long period of time with show
A. increased differences between the two
populations in genetic sequences.
B. decreased differences between the two
populations in genetic sequences.
C. no differences in genetic sequences.
D. no similar genetic sequences.
E. differences in the rate of mutation.
A
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Total fertility rates are ____
a. highest in developing countries in Asia and Africa b. higher now than 50 years ago c. at the replacement level d. currently measured at 6.5 e. above replacement in developed nations
Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
a. Cdk1 and cyclin B. b. cyclin D and p21. c. cyclin A and Cdk2. d. phosphorylation of RB by Cdk4 and Cdk2. e. external signals from growth factors.
All of the following are tenets of the cell
theory EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions
When leukocytes release the contents of their cytoplasmic granules, the process is called
A) leukocytosis. B) opsonization. C) inflammation. D) complement cascade. E) degranulation.