After seven half-lives of a drug, which of the following percentages of the medication or drug remains in the plasma of the person taking that drug?
a. less than 1%
b. 1.5%
c. 5%
d. 50%
A
After seven half-lives, less than 1% of the medication remains in the plasma. A drug's half-life is the time required for plasma concentrations of a drug to decrease to half of an initial value. After each successive half-life, half of the medication remains in the plasma that was there before. For instance, after the eighth half-life, less than 0.5% of the medication remains in the plasma, which is half of the medication in the plasma that was present after the seventh half-life
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A male patient whose father died of prostate cancer is concerned about his risk of developing the disease. He states he has heard that prostate cancer has a genetic link. What response is most accurate about prostate cancer?
A) "A number of studies have identified an association of BRCA-2 mutation with an increased risk of prostate cancer." B) "HNPCC is a mutation of two genes that causes prostate cancer in men and is autosomal dominant." C) "The mutation of the APC gene will result in the development of prostate cancer in middle-age men." D) "BRCA-1 is a mutant allele associated with autosomal-dominant predisposition to prostate cancer."
The primary sign of breast cancer is a painful mass in the breast, most often in the upper inner quadrant
Indicate whether the statement is true or false
Public health could benefit from improved technical architectures in the future. Which of these is not a likely technology for the future?
a. Service-oriented architecture (SOA) b. Software as a service (SaaS) c. Open source methods such as OpenELS or OpenMRS d. Mobile devices such as the iPhone
Each cell has the same:
a. Basic structure b. Function c. Size d. Shape