In agarose gel electrophoresis, DNA is visualized by ____
a. staining the gel with an agarose-binding dye so the gel, but not the DNA bands, fluoresces under UV light
b. staining the DNA with a DNA-binging dye that fluoresces under natural light
c. staining the DNA with X-gal so that the DNA bands appear blue
d. staining the gel with a DNA-binding dye that fluoresces under UV light
e. staining the gel with a DNA-binding dye that fluoresces under natural light
ANSWER: d
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The two strands of a DNA double helix are held to each other by ____ bonds between nitrogenous bases
a. phosphodiester b. disulfide c. glycosidic d. hydrogen e. peptide
Which of the following is a characteristic of obstructive airway disease?
a. exhalation volumes increase b. no net change in breathing volumes, but work increases c. lung compliance increases, patients breathe at high lung volumes d. breathing volumes decrease due to pleurisy
Which of the following is an example of a fibrous
joint? a. skull plates b. humerus to the scapula c. leg bone connected to the hip bone d. teeth connected to the jaw e. all of these
The part of a rocky shore in which barnacles, oysters, mussels, limpets, and brown algae are most common is called the
A) littoral or intertidal zone. B) infralittoral or subtidal zone. C) supralittoral or supratidal zone. D) superlittoral or supertidal zone.