On an axon, the small spacings between the insulation surrounding the axon are called
A. trigger zones.
B. axons.
C. synapses.
D. dendrites.
E. nodes of Ranvier.
E. nodes of Ranvier.
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The early Earth reducing atmosphere is thought to have lacked which of the following gases?
A. N2 B. O2 C. CO2 D. H2O E. SO4
If a person's blood type is A-, then the A antigen is found on that person's red blood cells and they also automatically have antibody that reacts with the Rh antigen.
a. true b. false
In a plasmid vector, the purpose of the lacZ gene is
a. to allow replication of the plasmid. b. to allow selection of transformed bacterial cells. c. to allow the plasmid to be cut once for cloning a fragment. d. to protect the plasmid from digestion by exonucleases. e. as an indicator that the plasmid is recombinant, containing a DNA insert.
Which of the following substances is commonly used to inactivate microbes?
A. formaldehyde B. alcohol C. synthetic detergents D. fluorescent dyes E. alum