During electrophoresis, DNA is
a. separated by its charge.
b. separated by its molecular weight.
c. compared to a standard ladder.
d. all of the above.
Answer: D
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Nucleic acid probes and immunological reagents are NOT commonly used in the clinical laboratory for the diagnosis of viral disease, because the cultivation of the virus is often difficult or even impossible
Indicate whether the statement is true or false.
Lipopolysaccharide of the outer membrane of gram-negative cell walls is called ________.
A. enterotoxin B. leukocidin C. exotoxin D. hemolysin E. endotoxin
Which one of the following is TRUE regarding baroreceptors?
A) Baroreceptors are pressure sensors that monitor blood pressure. B) Baroreceptors are located in the right atrium and right ventricle. C) Baroreceptors respond to high blood pressure by causing an increase in heart contraction. D) Baroreceptors respond to low blood pressure by causing vasodilation of the arterioles. E) Baroreceptors send nerve impulses directly to the heart.
The state of California has several large cities and very productive croplands that divert and use large amounts of water from rivers. What is one damaging effect of this use of water from the rivers?
A. increased amounts of solid waste pollution in the oceans B. decreased amounts of fresh water in marshes and estuaries C. changes in local rainfall amounts D. changes in upstream water tables