When membrane lipids are extracted from cells and used to prepare artificial lipid bilayers, cholesterol and sphingolipids tend to self-assemble into ________ that are more gelated and highly ordered than surrounding regions consisting primarily of _________.
a) microdomains, integral proteins
b) microdomains, phosphoglycerides
c) liquid crystals, microdomains
d) liquid crystals, phosphoglycerides
e) macrodomains, phosphoglycerides
Ans: b) microdomains, phosphoglycerides
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The typical resting potential of an isolated neuron is
a. ?60 mV. b. ?70 mV. c. ?80 mV. d. ?90 mV. e. ?100 mV.
Short tandem repeats on ____ may be used to determine genetic relationships among male relatives and descendants
a. the Y chromosome b. chromosome 3 c. the X chromosome d. chromosome 8 e. chromosome 20
Shrimps, crabs, and lobsters are examples of ____
a. cephalopods b. gastropods c. mollusks d. arachnids e. crustaceans
When referring to attenuation in regulation of the trp operon, it would be safe to say that when there are high levels of tryptophan available to the organism, ________
A) transcriptional termination is likely B) ribosomes are stalling during translation of the attenuator region C) translational termination is likely D) the trp operon is being transcribed at relatively high levels E) tryptophan is inactivating the repressor protein