Gene therapy is performed by ____
a. replacing the genomes of an individual with a brand new set of genomes with the goal of treating a genetic
defect
b. replacing a defective gene in an individual with a normal gene with the goal of treating a genetic disorder
c. transferring a mutated gene into an individual with the goal of treating a genetic defect
d. transferring a normal or a modified gene into an individual with the goal of treating a genetic defect
e. replacing a defective enzyme in an individual with a normal enzyme with the goal of treating a genetic
disorder
ANSWER: d
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The receptors for steroid hormones are located inside the cell instead of on the membrane surface like most other signal receptors. This is not a problem for steroids because _____
A) the receptors can be readily stimulated to exit and relocate on the membrane surface B) steroids do not directly affect cells but instead alter the chemistry of blood plasma C) steroid hormones are lipid soluble, so they can readily diffuse through the lipid bilayer of the cell membrane D) steroids must first bond to a steroid activator, forming a complex that then binds to the cell surface
In cancer cells one allele of the tumor suppressor gene p53 is frequently mutated so that the protein is inactive, not produced, or deleted
The other allele will usually have a normal sequence and the promoter remains intact but the gene is not expressed. Sequencing with sodium bisulfite modification of DNA can be used to detect which cytosines are methylated. If the cancer cell DNA is sequenced what would be the anticipated results? A. Cytosines in or near the promoter region will be methylated B. Cytosines in or near the promoter will not be methylated C. Cytosines in the coding region will have an increased mehtylation D. There will be no differences in the methylation pattern of the promoter of p53 from a cancer cell and a normal cell
Neurotransmitters are stored in vesicles located within axon terminals
Indicate whether the statement is true or false.
Animals that obtain their body heat from internal metabolism are called:
a. ectotherms. b. poikilotherms. c. endotherms. d. osmoconformers. e. osmoregulators.