The two major types of lymphocytes are
A) T and B cells.
B) A and B cells.
C) cytokines and antibodies.
D) RBCs and WBCs.
A) T and B cells.
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Dandelions, Taraxacum officinale, are plants that asexually produce fruitlike propagules. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept. B. Biological species concept. C. Evolutionary species concept. D. Ecological species concept. E. Both the evolutionary and ecological species concepts.
Darwin's voyage took place between ____
a. 1730 and 1735 b. 1831 and 1836 c. 1853 and 1858 d. 1878 and 1885 e. 1930 and 1938
Microevolution is the result of all of the following EXCEPT
a. chance variation. b. change in gene frequency. c. mutation. d. natural selection. e. large scale patterns or trends.
In meiosis chromosomes containing sister chromatids (not homologous chromosomes) align along the center of the cell during
A. prophase I. B. prophase II. C. interphase II. D. metaphase I. E. metaphase II.