To which of the following do the pharyngeal
arches NOT contribute in a human embryo?
a. pharynx
b. larynx
c. face
d. gills
e. pharygeal arches contribute to all of these
structures in a human embryo
D
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Gene regulation is referred to as combinatorial control when:
A. some transcription factors are common to the regulation of multiple genes. B. some transcription factors are unique to the regulation of a single gene. C. certain transcription factors are only used for initiation of transcription of housekeeping genes.
How does the likelihood of the survival of technological societies restrict the number of civilizations with which we might communicate?
What will be an ideal response?
Because a steroid hormone is nonpolar, it ____
a. must be transported across a cell membrane with a receptor molecule b. is equipped with specific receptor molecules c. can dissolve in blood d. can diffuse directly across a cell membrane e. is an inhibiting hormone
What ensures the one-way direction of an action potential?
A. Conduction of an action potential is an all-or-none event. B. An axon can conduct a volley of action potentials very quickly. C. Action potentials are self-propagating. D. An action potential at one node causes an action potential at the next node. E. As soon as the action potential has passed by, that portion of the axon undergoes a short refractory period.