Epinephrine is an example of _____
A) an androgen
B) an estrogen
C) a progestin
D) a catecholamine
E) a glucocorticoid
Answer: D
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Meselson and Stahl relied on equilibrium density gradient centrifugation in a ________ solution to resolve the DNA containing 14N from the DNA containing 15N.
A) radiolabeled phosphate B) calcium chloride C) radiolabeled nitrogen D) sodium acetate E) cesium chloride
The direct result of cytoplasmic fusion is the
production of a a. dikaryotic cell. b. zygote. c. gamete. d. spore. e. mushroom.
Which sequence lists the layers of a mammalian gut in order, from the outside to the inside (toward the lumen)?
a. mucosa, submucosa, muscularis, serosa b. muscularis, mucosa, submucosa, serosa c. serosa, mucosa, submucosa, muscularis d. serosa, muscularis, submucosa, mucosa
A Type I survivorship curve is ___________
A. convex, such as that of humans B. diagonal, such as that of lizards, small mammals, and large birds C. concave, such as marine animals that release eggs D. S-shaped, such as that of small birds E. logarithmic, such as that of weeds