Gene silencing in RNA interference blocks an undesirable product by
a. blocking RNA polymerase from binding the DNA.
b. binding siRNAs to mRNA transcripts, marking the mRNA for destruction.
c. blocking transcription.
d. blocking DNA replication.
Ans: b. binding siRNAs to mRNA transcripts, marking the mRNA for destruction.
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The Pimas are a group of people living in the southwestern United States and Mexico
Although Pima Indians living in the United States and Mexico have a similar genetic background, a five-fold increase in the incidence of type II diabetes mellitus among U.S. Pima has been reported. The body mass index of Mexicans of non-Pima descent, Mexicans of Pima descent, and Pimas living in the United States is shown in the figure above. Based on this information and the graph above, what can you infer about the incidence of type II diabetes mellitus? A) Obesity is a risk factor for development of type II diabetes mellitus. B) If you maintain a normal body weight (body mass index less than 25), you will not get type II diabetes mellitus. C) The incidence of type II diabetes mellitus has increased in the past ten years. D) People who develop type II diabetes mellitus are typically diagnosed in childhood or adolescence.
A nonliving source of an infectious agent that infects a large number of people is called a
A) fomite. B) reservoir. C) vector. D) vehicle.
An infection of the urinary bladder is known as:
A) cystitis. B) pyelonephritis. C) ureteritis. D) urethritis.
The building blocks or monomers of nucleic acid molecules are called _____.
A. nucleotides B. polysaccharides C. amino acids D. DNA and RNA