What prevents growth plates from calcifying, preserving their ability to grow?
a. growth hormone
b. calcium
c. phosphate
d. signals from the nervous system
e. thyroid hormone
ANSWER: a
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If a gene is found in different groups, it is said to be
A. active. B. variable. C. conserved. D. associational. E. endogenous.
The statement "The virulence of many pathogens in humans may not be a target of selection itself, but rather an accidental by-product of selection on other traits" describes ________
A) the coincidental evolution hypothesis B) the shortsighted evolution hypothesis C) the trade-off hypothesis D) the energy-balance hypothesis
Over 6000 species of prokaryotes have been identified. What percentage of the total number of prokaryotic species on Earth does this represent?
a. 1% b. 10% c. 30% d. 90%
Change in chromosome structure in which the end of a chromosome breaks off or two simultaneous breaks lead to the loss of an internal segment; often causes abnormalities—e.g., cri du chat syndrome.
What will be an ideal response?