Teichoic acids, mycolic acids, peptidoglycan, and disaccharide-pentapeptide subunits are all building blocks of which bacterial structure?
a. Outer cell membrane
b. Flagella
c. Inner cell membrane
d. Cell wall
D
These elements are all part of the cell walls of some types of bacteria.
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CpG islands are associated with which of the following?
A. Nucleosome location B. DNA methylation C. Steroid hormone activity D. cAMP pathway
Cross-mating may occur between two different species but the resulting offspring survive poorly and are sterile. Why is this particularly important to endangered species that cross-mate?
a. This can lead to extinction of particular species. b. The resulting hybrids are the basis for a new species. c. Hybrids increase the reproductive capacity of the endangered species. d. This will lead to genetic divergence in the population. e. This can lead to an increase in numbers of the endangered species.
How do cholinesterase inhibitors improve the learning and memory of people who are suffering from Alzheimer's Disease?
A. Cholinesterase inhibitors will decrease the levels of acetylcholine in the brain. This will increase the neural functioning in brain regions associated with learning and memory. B. Cholinesterase inhibitors will increase the levels of testosterone in the brain. This will increase the neural functioning in brain regions associated with learning and memory. C. Cholinesterase inhibitors will decrease the levels of cerebral spinal fluid in the brain. This will decrease neural pressure associated with the brain regions associated with learning and memory. D. Cholinesterase inhibitors will increase the levels of acetylcholine in the brain. This will increase the neural functioning in brain regions associated with learning and memory.
Encephalitis is more common in the summer months because
A) pathogens are present in swimming pools and lakes. B) ameba populations increase in swimming pools. C) ticks are encountered while hiking in the woods. D) mosquito populations increase. E) people encounter more bats during warm summer evenings.