What type of immune cell gathers up antigenic material from its surroundings and mature into antigen-presenting cells?
a. T helper cells
b. B cells
c. dendritic cells
d. natural killer cells
c. dendritic cells
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Most eukaryotic genes contain noncoding sequences called ________ that are interspersed with the coding sequences.
A. introns B. exons C. codons D. spacers E. spliceosomes
Phospholipids such as lecithin are used extensively in food preparation because they
a. provide the agreeable feel of fat melting on the tongue. b. are excellent emulsifiers. c. provide important textural features. d. impart delicate flavors.
Most digestion and the major site of absorption is in the
A. large intestine. B. cecum. C. colon. D. small intestine.
All of the following are problems in the management of antibiotic usage, except
A. the selection of antibiotics based on results of appropriate antibiotic susceptibility testing. B. the sale of many antibiotics over-the-counter in foreign countries. C. the use of antibiotics for upper respiratory viral infections. D. extensive use of broad-spectrum drugs for minor infections. E. There are no exceptions here. All of these are challenges in the management of antibiotic usage.