Which disorder is similar in nature to sickle-cell anemia?
a. malaria
b. leukemia
c. aplastic anemia
d. thalassemia
e. toxemia
ANSWER: d
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The origin of a skeletal muscle is
(a) attached to the less mobile portion of the skeleton. (b) attached to the portion of the skeleton that moves when the muscle contracts. (c) never attached to the skeleton. (d) its belly.
If you cross RrYy and RRyy pea plants, what fraction of the offspring will have yellow peas? R = round, r = wrinkled, Y = yellow, y = green.
A. 100% B. 50% C. 75% D. 25% E. 0%
Treponema pallidum is the bacterium that causes syphilis. The gram-negative spirochete has never been cultured on bacteriological media. Select the statement that most accurately describes this disease-causing microbe.
A. Koch's postulates cannot be fulfilled for this disease. B. There is no satisfactory way to identify the disease without being able to grow it. C. There is no way to perform an epidemiological study on this disease. D. Because the bacterium cannot be grown, there is no way to characterize the organism as to staining features, biochemical test reactions, molecular testing, etc.
Antimicrobials that block protein synthesis by binding to the mRNA are
A. aminoglycosides. B. antisense nucleic acids. C. macrolides. D. beta-lactams. E. nucleic acid analogs.