The main function of villi and microvilli in the small intestine is to ________
a. all of the choices
b. secrete bile salts
c. increase surface area for absorption
d. produce vitamins
c
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The E test is
A. used to measure esculine levels in pasteurized milk. B. a quantitative antibiotic sensitivity test that utilizes plastic strips impregnated with an antibiotic of interest. C. used to quantify levels of IgE antibody in serum samples. D. a rapid serological test used to detect the presence of eastern equine encephalitis virus in cerebrospinal fluid.
To which of the following groups does the organism
in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. none of the above
In the process by which cDNA is formed, reverse transcriptase is used to produce _____ from
_______. a. double-stranded cDNA; single-stranded mRNA b. double-stranded mRNA; single-stranded cDNA c. single-stranded cDNA; single-stranded mRNA d. single-stranded mRNA; single-stranded cDNA e. double-stranded cDNA; double-stranded mRNA
There has been a lot of discussion about stem cell research in mainstream literature (i.e., newspapers and magazines). Stem c ells come from all of the following except:
a) umbilical cord b)embryos c) bone marrow d) Stem cells can come from all of these sources