Mycobacterium leprae primarily infects
A) macrophages.
B) skin cells.
C) neurons.
D) macrophages and skin cells.
E) skin cells and neurons.
B
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Positive and negative transcriptional regulation differ in that:
A. positive regulation requires that a promoter be present; it's not necessary in negative regulation. B. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, no such protein is necessary. C. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, such binding prevents transcription. D. in positive regulation, the absence of a regulatory protein promotes transcription; in negative regulation, the absence of a regulatory protein promotes transcription. E. None of these choices is correct.
In clinical studies, nutritional supplements that
block the activity of myostatin had which of the following effects?
a. increased muscle mass in both homozygotes and heterozygotes b. increased muscle mass in homozygotes only c. increased muscle mass in heterozygotes d. reduced muscle mass in both heterozygotes and homozygotes e. the nutritional supplements had on effect at all
The cell responsible for producing a rapid antibody response against a foreign protein when it is encountered years after the first encounter is a
A. memory T cell. B. killer T cell. C. memory B cell. D. plasma cell.
The respiratory control center is located in the
A) diaphragm. B) cortex. C) medulla. D) hypothalamus. E) spinal cord.