Which of the following choices is a proximate cause of the non-combative behavior of male African
cichlids that do not hold territories?
a. Cichlids can detect and store information about aggressive encounters.
b. The GnRH-producing neurons in the hypothalamus are small.
c. The testes produce no testosterone.
d. GnRH production is high.
e. Noncombative behavior allows the male to build his strength for a takeover attempt on a
territory.
B
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Chromosomes in which the normal order of a block of genes is reversed contain a(n)
A. duplication B. insertion C. inversion D. reciprocal translocation E. none of these
A person with O type blood
A. lacks all of the alleles for ABO blood type. B. lacks A and B antigens. C. is called a universal recipient. D. could not have the Rh factor.
Many amphibians now face extinction, and one cause is believed to be a __________ fungus. Fill in the blank(s) with the appropriate word(s)
Ras is a GTP-binding protein that is often defective in cancer cells. A common mutation found in cancer cells causes Ras to behave as though it were bound to GTP all the time, which will cause cells to divide inappropriately
From this description, the normal Ras gene is _______. (a) a tumor suppressor. (b) an oncogene. (c) a proto-oncogene. (d) a gain-of-function mutation.