In the central nervous system, nerves are called
a. reflex arcs.
b. nerve tracts.
c. nerve pathways.
d. neurofibers.
e. monosynaptic paths.
B
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Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
The primary precursor utilized in gluconeogenesis is
A. glycogen. B. starch. C. glycerol. D. the amino acid glutamate. E. the nucleic acid guanosine.
Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?
a. Antibiotics b. Vaccination c. Mosquito control d. Quarantine e. Improve water quality
Viruses and bacteria were first cultured in the laboratory at about the same time.
Answer the following statement true (T) or false (F)