Acridine dyes are mutagens that
A) disrupt the reading frame of the gene.
B) replace an AT base pair with a GC base pair.
C) reverse the polarity of the double helix.
D) kill cells.
A) disrupt the reading frame of the gene.
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Epiglottitis is a potentially life-threatening disease because the patient's airway can become completely obstructed (blocked) if not treated. Which bacterium usually causes this disease?
a. Haemophilus influenzae type B b. Corynebacterium diphtheriae c. Streptococcus pyogenes d. Type A influenza virus
In order to establish a membrane potential, the
cytoplasmic fluid is ____ compared to the interstitial fluid
a. more positively charged b. more negatively charged c. hypertonic d. hypotonic e. none of these
Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model
for __________, which may have preceded cells. Fill in the blank(s) with the appropriate word(s).
The gradient distributions of alleles across continents reflect _____
a. the delineation of new races b. genetic drift c. human migration patterns d. protective alleles e. natural selection