The functional relationship between glial cells and neurons is analogous to the functional relationship between what cell types in plants?
A. cork cambium cells and primary meristem
B. tracheids and vessel elements.
C. parenchyma and schlerenchyma
D. companion cells and sieve tube elements
E. epidermal cells and ground tissue cells
D
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What percent of analytes in plant samples identified from mass spectrometry are classified as
“unknown”?
a. 6% d. 60% b. 16% e. 96% c. 46%
Clayton and colleagues (2003 ) examined the frequency of host shifts observed among both wing feather and body lice that infect doves
They observed that body lice rarely shift host species, whereas wing feather lice often shift from one species to another. The higher frequency of host shifts observed in wing feather lice is due to the observation that ________. A) wing feathers containing lice molt frequently, and are frequently used by other hosts to build nests B) body feathers do not come into contact with other hosts as frequently as wing feathers C) the lice that infect wing feathers often move from host to host on a parasitic fly D) doves preen each other's wing feathers at a higher frequency than body feathers
RFLPs are commonly used in recombinant DNA technology to ________
A) generate pharmaceutical products of interest B) substitute for oligonucleotides C) map genes and construct DNA fingerprints D) cleave DNA of interest E) serve as recombinant DNA vectors
An agent that reproduces in cells but is NOT composed of cells and contains RNA as its genetic material is a(n)
a. Alga. b. Bacterium. c. Fungus. d. Helminth. e. Virus.