The margin of safety is often referred to as
a. the effective dose
b. the lethal dose.
c. the safety parameter.
d. the therapeutic index.
.D
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The distinguishing characteristic of connective tissue is
A) the collagen fibers that offer support. B) the presence of extensive extracellular matrix containing widely scattered cells. C) always dividing, constantly being replaced throughout the body. D) that it is arranged in sheets of tissue that lie on body surfaces. E) All of these characteristics help make connective tissue unique.
Ammonia is
A. a waste product of fatty acid metabolism. B. exhaled by the lungs into the air. C. processed by the liver to form urea, a less toxic compound. D. a waste product of fatty acid metabolism and is excreted by the kidneys into urine. E. a polypeptide containing many amino acids.
Which number indicates the arrector pili muscle?
A. 1 B. 2 C. 3 D. 4 E. 5
Which of the following statements is correct regarding RNA?
A) rRNA is always attached to the rough ER. B) If the base sequence of DNA is ATTGCA, the messenger RNA template will be UCCAGU. C) There is exactly one specific type of mRNA for each amino acid. D) Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis.