For which of the following histones has variant forms not yet been identified?
A. H1
B. H2A
C. H2B
D. H3
E. H4
E
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Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
The vertebrate autonomic system
a. carries signals to and from visceral organs. b. is a functional division of the peripheral nervous system. c. includes the sympathetic and parasympathetic divisions. d. includes afferent and efferent nerve fibers. e. includes all of these descriptions.
____________________ junctions are channels that connect the cytoplasm of neighboring cells. Fill in the blank(s) with the appropriate word(s)
Which of the following statements regarding the oxygen atom of a water molecule is true?
A) Oxygen is more positively charged than the hydrogen atoms. B) Oxygen attracts electrons less strongly than the hydrogen atoms. C) Oxygen is more electronegative than the hydrogen atoms. D) Oxygen is attracted to the negatively charged atoms of other molecules.