Which of the following statements is true?
a. Although hormones are carried to all parts of the body, they produce effects only in cells
with proper receptors.
b. Hormones are limited to steroid compounds.
c. Hormones are secreted by specialized exocrine glands.
d. Most hormones are controlled by positive feedback mechanisms involving the pituitary
gland.
e. Hormones are supplied to the body in the diet.
A
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If a scientist were to shoot protons through an atom, for instance like Rutherford did with gold foil, he or she would likely find that
A. most of the protons passed straight through the atom. B. few of the protons passed straight through the atom. C. most of the protons deflected or bounced back from the atom. D. most of the protons would be absorbed by the atom. E. All of the choices are correct.
Which of these is not considered a difficulty with the biological species concept?
A. fossil species B. inbreeding species C. asexual species D. ring species
Which two species are believed to have evolved from Homo ergaster?
A. Homo habilis & Cro Magnon man B. Homo erectus & Homo rudolfensis C. Homo erectus & Homo floresiensis D. Homo rudolfensis & Homo floresiensis
Cholesterol is taken up into most cells of the body by
a. phagocytosis. b. receptor-mediated endocytosis. c. simple diffusion. d. caveolae formation.