The most primitive mammals, the ________, are oviparous like their reptilian ancestors.
Fill in the blank(s) with the appropriate word(s).
monotremes
The most primitive mammals, the monotremes, are oviparous like their reptilian ancestors.
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During activation of a T cell, the cytokine it produces to stimulate its own proliferation is ________.
A. interleukin 1 B. interleukin 2 C. tumor necrosis factor D. interferon gamma
Most new alleles probably arise from ____
a. crossing over between homologous chromosomes b. independent assortment of nonhomologous chromosomes c. rearrangement of existing alleles into new combinations d. small-scale mutations in DNA e. large-scale changes in chromosome structure
The most important chemical group that determines how tightly histones bind DNA is
A) acetyl. B) methyl. C) ethyl. D) phosphate.
All of the following pathogens cause respiratory infections EXCEPT
A) Mycobacterium tuberculosis B) Chicken Pox virus C) Bordetella pertussis D) Papilloma virus E) Measles virus