Once a threshold is reached,
a. the number of sodium gates that open depends upon the strength of a stimulus.
b. a graded local potential will be unable to spread to a trigger zone of the nerve membrane.
c. the resting potential of a neuron is restored.
d. the potassium channels in the input zone open.
e. the opening of sodium gates and the accompanying flow of sodium ions is an example of
positive feedback.
E
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Review the pedigree shown in Figure 17.7 and choose the most accurate statement about the inheritance of an X-linked recessive mutation
A. For rare X-linked traits, most of the affected individuals are males. B. Daughters of affected males are always affected. C. The offspring of an affected male are usually affected. D. The sons of the sisters of affected males will always be affected. E. The brothers of affected males are always affected.
Tracheal tubes and spiracles are characteristically found in annelids
____________________ Indicate whether the statement is true or false.
An allele that is always expressed whenever it is present is called
A.) recessive B.) superior C.) phenotypic D.) dominant
Which immunoglobulin class/es can fix complement?
A. IgM and IgG B. IgM only C. IgD only D. IgG only E. IgE and IgA