One possible reason for a "senior moment" might be
a. loss of neurotransmitter.
b. demyelination of CNS neurons causing slower conduction of impulses.
c. toxins building up in the brain over the years.
d. slower release of neurotransmitters.
e. both b and d.
E
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The natural habitat of the bacterium Sphingobacterium is:
a. environment. b. animal oral and respiratory flora. c. environment, cold climates. d. human normal flora.
Viral nucleic acid types include which of the following?
A. Double-stranded DNA B. Single-stranded RNA C. Double-stranded RNA D. Single-stranded DNA E. All of the choices are correct.
HEPA filters are used to remove microbes from
A. air. B. liquids. C. medical instruments. D. human tissues. E. All of the choices are correct.
In a lysosomal storage disease, newly synthesized lysosome hydrolases are secreted from the cells rather than being delivered to the lysosomes. What is one possible mechanism for this result?
A) The cis-Golgi network lacks a proton gradient. B) The ER is unable to produce lysosomal vesicles. C) Lysosomal enzymes are not phosphorylated in the rER. D) Mannose is not phosphorylated in the cis-Golgi network. E) All the hydrolase genes are mutated, resulting in synthesis by ribosomes free in the cytoplasm rather than on the endoplasmic reticulum membrane.