Surgery of the spinal cord most often involves cutting of the
A) superior articular facet.
B) lamina.
C) transverse process.
D) body.
E) spinous process.
B) lamina.
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Transcription factors function in the expression of genes by
A) initiating replication. B) associating to initiate translation. C) turning transcription of specific genes on or off. D) halting the activity of RNA polymerase at the end of transcription.
Why does countercurrent exchange optimize gas exchange across some gills?
a. It sustains an optimal thermal environment for gas exchange. b. It optimizes perfusion to the respiratory surface. c. It sustains an optimal respiratory gas concentration gradient, allowing diffusion to occur across the entire respiratory surface. d. It optimizes delivery of the respiratory medium to the respiratory surface. e. It minimizes diffusional area.
In eukaryotes a series of ________ residues are added to the 3' end of an RNA molecule as part of the posttranscriptional processing used to produce functional mRNA.
A. guanine B. cytosine C. adenine D. uracil
The definitive host of a parasite is
A. the host for immature stages of the parasite. B. where the mature form of the parasite occurs. C. also the vector for the parasite. D. the host that the parasite name is based on. E. the host for the dormant stage of the parasite.