Which of the following statements about gram-negative cell walls is FALSE?
A) They protect the cell in a hypotonic environment.
B) They have an extra outer layer composed of lipoproteins, lipopolysaccharides, and phospholipids.
C) They are toxic to humans.
D) They are sensitive to penicillin.
E) Their Gram reaction is due to the outer membrane.
D
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Which of the following processes consists of
modifying an individual’s genome?
a. DNA hybridization b. PCR c. SNPing d. DNA profiling e. genetic engineering
All Old Order Amish families from Lancaster County with Ellis-van Creveld syndrome can trace their genealogies to Mr. and Mrs. Samuel King, who immigrated to Lancaster County in 1744. This is an example of __________
A) founder effect B) mutation C) gene flow D) Hardy-Weinberg equilibrium E) bottleneck effect
When whole cells or large molecules in solution are engulfed by a cell, this endocytosis is specifically termed
A. facilitated diffusion. B. pinocytosis. C. phagocytosis. D. facilitated transport. E. exocytosis.
Which of the following is NOT a limitation of nutritional assessments?
a. A long time may elapse between the initial development of poor nutritional health and the first clinical evidence of a problem. b. Clinical signs and symptoms of nutritional deficiencies often are not very specific. c. Often it is not possible to separate the best nutritional state from one that is slightly jeopardized. d. Most nutrition assessments are time-consuming, costly, and do not provide valuable information.