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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology

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

Biology & Microbiology