If two populations diverge geographically and/or genetically from each other, and the process
continues long enough, they may become two different:a.
species.
b. hybrids.
c. polyploids.
d. allopolyploids.
e. euploids
A
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When human volunteers were given high doses of AAS, ____
a. TSH levels increased b. gonadotropin levels increased c. natural testosterone levels increased d. thyroxine levels decreased e. TSH levels were unaffected
In what way do the various membranes of a cell differ?
a. Phospholipids are found only in certain membranes. b. Certain proteins are unique to each membrane. c. Only certain membranes are constructed from molecules with dual solubility. d. Only certain membranes of a cell are selectively permeable. e. Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.
In Figure 17-1, the purpose of electrical shock at the stage of the process labeled A is to:
a. kill the egg cell nucleus.
b. initiate fusion of the two cells.
c. stimulate cell division.
d. induce mutations.
e. initiate apoptosi
Hydrogen bonds between different parts of the polypeptide chain result in which level of protein structure?
A. primary B. secondary C. tertiary D. quaternary