Opportunistic organisms are those that:
a. are usually commensals but can cause disease when body defenses are suppressed
b. usually cause disease in a previously healthy person when they enter through the correct portal of entry
c. inhabit the intestine but are incapable of causing disease.
d. require a vector
a. are usually commensals but can cause disease when body defenses are suppressed
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If a human female has 2 Barr bodies per cell, it is almost certain that
A. her father had 1 Barr body per cell. B. her mother also had 2 Barr bodies per cell. C. she developed from a fertilized egg with 3 X chromosomes. D. she is genetically a male with female characteristics. E. she is genetically a normal fertile female.
Which of the following is NOT unique to
angiosperms?
a. endosperm b. a cell within the female gametophyte that has two nuclei c. pollen tubes d. double fertilization e. more than one of these is NOT unique to angiosperms
Define positive feedback and describe why they are not necessarily beneficial to organisms. Include a
description of the changes associated with severe blood loss and circulatory shock to substantiate your answer. What will be an ideal response?
If we try to preserve evolutionary history, the loss of which species would produce the loss of the most sig-nificant phylogenetic diversity?
a. A c. C b. B d. D