Following infection of a white blood cells by the human immunodeficiency virus (HIV), viral reverse transcriptase
produces a ____ copy of its RNA genome.
a. single stranded DNA
b. double stranded DNA
c. single stranded RNA
d. double stranded RNA
e. backwards DNA
ANSWER: b
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Evolution is driven by
A) random mutation. B) novel metabolic pathways. C) selection pressure. D) selection pressure applied to random mutation.
The most significant finding from the "split brain" patients studied by Roger Sperry and his collaborators was that
A. in most human brains, the left hemisphere is specialized for processing verbal and symbolic material; the right hemisphere is specialized for visuospatial and emotional processing. B. the right and left hemispheres are mirror images of each other and equally dominant in producing and understanding language in humans. C. to evaluate the functional capacity of each hemisphere in split-brain patients, it is essential to provide information to one side of the brain only. D. the severing of the corpus callosum is a necessary and effective remedy for halting grand mal seizures in epilepsy.
Lysosomes digest intracellular debris, such as organelles, through the process of ____________.
A. endocytosis B. phagocytosis C. autophagy D. pinocytosis E. excocytosis
A toxin that is secreted and acts upon a specific cellular target is called a(n)______
Fill in the blank(s) with the appropriate word(s).