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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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.
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.