Receptor potentials may generate action potentials in the receptor cell itself, or they may cause ________ that stimulates an associated neuron to generate action potentials
A) an increase in blood flow
B) an influx of Cl-
C) a change in pressure
D) the production of glucose
E) the release of neurotransmitter
E
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Which of the following factors likely did NOT contribute to the evolution of distinctive human characteristics relative to Great Apes?
A. alteration of developmental timing so that certain juvenile characteristics are retained in the sexually mature adult B. the evolution of bi-pedalism followed by evolutionary modifications to the skull, pelvic structure, foot and legs C. the evolution of bi-pedalism followed by increasingly sophisticated tool use, cognitive ability, and social organization D. the evolution of the FoxP2 gene associated with more sophisticated language E. the evolution of opposable thumbs followed by increasingly sophisticated tool use
Which of the following is true about all E.coli?
a. E.coli produce toxic proteins b. E.coli is only found in cows, deer, goats, and sheep c. E.coli is a common bacterium living in our intestines d. E.coli originate from fresh produce e. E.coli strains harmful to humans are also harmful to cattle
You have isolated DNA for PCR and accidentally added topoisomerase instead of polymerase to your sample. What would you expect if you ran this DNA sample on a gel?
A) The DNA would show increased supercoiling and have a lower electrophoretic mobility. B) The DNA would show decreased supercoiling and have a higher electrophoretic mobility. C) The DNA would show increased supercoiling and have a higher electrophoretic mobility. D) The DNA would show decreased supercoiling and have a lower electrophoretic mobility. E) The DNA would show decreased supercoiling, but electrophoretic mobility will be unaffected.
Cells that do not divide are usually arrested in
a. S. b. G1. c. G2. d. M. e. prophase.