The most abundant mineralocorticoid is
a. epinephrine.
b. norepinephrine.
c. aldosterone.
d. cortisol.
e. estrogen.
C
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Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, all the same species, have descended from wolves. This process is referred to as
A. convergent evolution. B. natural selection. C. inheritance of acquired traits. D. artificial selection.
What is the part of a sarcomere that contains only thin filaments?
A) Z line
B) H band
C) I band
D) A band
Scientists suspect that the first macromolecules to form when cells first arose were
A. enzymes. B. RNA. C. DNA. D. polysaccharides.
Which of the following organelles are most likely to be able to divide and reproduce much like a cell does?
A. both mitochondria and chloroplasts B. peroxisomes only C. mitochondria only D. chloroplasts only E. mitochondria, chloroplasts, and lysosomes