A serous membrane lines a body cavity that opens to the outside of the body
____________________ Indicate whether the statement is true or false.
False - does not open
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Natural selection acts on the genetic makeup of
A. genotypes. B. populations. C. individuals. D. communities. E. alleles.
Sutherland discovered that the signaling molecule epinephrine _____
A) brings about a decrease in levels of cAMP as a result of bypassing the plasma membrane B) causes lower blood glucose by binding to liver cells C) interacts directly with glycogen phosphorylase D) elevates cytosolic concentrations of cyclic AMP
Repressor proteins do not __________________.
A. prevent binding of RNA polymerase to DNA B. cause the DNA regions that contain the operator to twist or loop C. inactivate operon genes when their products are not required D. bind to sets of operators E. increase transcription rates
Nucleoli are present during _____.
Fill in the blank(s) with the appropriate word(s).