The protein-coding region of a eukaryotic gene ____
a. can be amplified directly from the genome
b. is obtained by producing a cDNA copy from the gene’s transcript
c. contains introns, so an mRNA copy must be produced from the gene’s transcript
d. contains exons that are removed by restriction enzymes, while the remaining introns are ligated together
e. contains introns that are removed by restriction enzymes, while the remaining exons are ligated together
ANSWER: b
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Tuberculosis remains a serious worldwide health problem due to all of the following except
A. multi-drug resistance. B. social factors such as crowding and incarceration. C. the prevalence of HIV infections. D. ease of transmission. E. absence of MDR strains.
Until renamed by Paul Ehrlich in the 1890s, the heat-labile, nonspecific part of the immune system that enhances inflammation was known as "alexin". We now know that various proteins of this system attract neutrophils to tissues, direct phagocytosis of targets by neutrophils and macrophages, burst pathogens by insertion of the membrane attack complex (MAC), stimulate histamine release, and increase capillary permeability. What did Ehrlich rename this part of the immune system?
A. complement B. contingent C. Toll-like response D. acquired immunity E. MBL
Differentiation is the process by which cells
a. mature into larger cells. b. change from one type of muscle to another. c. allows cells to change to fix injuries. d. turn on all the genomic genes. e. become specialized by turning on some genes and turning off others
The contraceptive pill works by
1.causing the endometrium to break down 2.preventing fertilization 3.preventing implantation of a fertilized egg 4.preventing ovulation