During mitosis, the centromeres _____, and daughter chromosomes go into _________.
Fill in the blank(s) with the appropriate word(s).
divide
each new nucleus
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Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.
Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth. b. Senescence results in increased hormone secretion. c. Postnatal development occurs before birth. d. In general, boys experience their pre-adolescent growth spurt later than girls. e. Early childhood is a time of rapid cell division in nerve cells.
Dental plaque is an example of
A) a pellicle. B) a biofilm. C) gingivitis. D) dentin. E) tooth enamel.
HIV causes acquired immunodeficiency by infecting
A. B cells. B. helper T cells. C. cytotoxic T cells. D. thymus cells. E. both B and cytotoxic T cells.