The human biceps and triceps muscles may be described best as working
a. independently.
b. synergistically.
c. antagonistically.
d. synchronistically.
e. involuntarily.
C
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The placenta takes over progesterone production at which developmental week in humans?
a. 4 b. 8 c. 12 d. 16 e. 20
The only known source of human embryonic stem cells is:
a. placental tissue. b. umbilical cords. c. early human embryos. d. brain tissue. e. nerve tissue.
Which description illustrates the tertiary structure of a protein molecule?
a. bonding of two amino acids to form a dipeptide b. folding of a peptide chain to form an alpha helix c. association of several polypeptide chains by weak bonds d. order in which amino acids are joined in a peptide chain e. three-dimensional shape of an individual polypeptide chain
In transmission electron microscopy, the specimen is placed on a
a) copper mesh grid. b) glass slide. c) plastic slide. d) magnesium mesh grid.