Why does allopatric speciation occur?
a. because adaptive radiation has occurred
b. because gene flow has occurred
c. because mutations have occurred
d. because geographic isolation has occurred
d. because geographic isolation has occurred
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In patients who do not have HIV, which underlying condition is considered a risk factor for acquiring PCP?
a. Malaria b. Cystic fibrosis c. Cytomegalovirus d. Myasthenia gravis
Antimetabolites include all of the following except
A) trimethoprin B) isoniazid C) nitrofurantoin D) sulfanilamide
Which enzyme is used to bind DNA fragments together?
A) restriction enzyme B) lysozyme C) DNA ligase D) DNA polymerase
Aspergillosis includes all the following, except
A. life-threatening infections in AIDS, leukemia, and transplant patients. B. most cases are due to A. fumigatus. C. there are no effective drugs to treat the infection. D. a pneumonia that disseminates to the brain. E. noninvasive infections of the eyelids, sinuses, conjunctiva, and ear canals.