What axonal characteristic facilitates the propagation of an action potential along a myelinated axon?
a. Voltage-gated Na+ and K+ channels are concentrated in the myelinated axonal segments.
b. Voltage-gated Na+ and K+ channels are concentrated in the unmyelinated axonal segments.
c. Voltage-gated Na+ channels are concentrated in the myelinated axonal segments; voltage-gated K+ channels
are concentrated in the unmyelinated axonal segments.
d. Voltage-gated K+ channels are concentrated in the myelinated axonal segments; voltage-gated Na+channels
are concentrated in the unmyelinated axonal segments.
e. Voltage-gated Na+ K+ channels are spread evenly throughout both myelinated and unmyelinated segments
b
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Strong selection against the recessive phenotype
a. reduces the equilibrium frequency of the recessive genotype b. completely eliminates the recessive genotype c. has no effect on the recessive genotype
Renin is secreted by which one of the following structures?
A) distal tubule B) juxtaglomerular apparatus C) renal medulla D) glomerulus E) Bowman's capsule
The male gametophytes of flowering plants are also referred to as _____.
Fill in the blank(s) with the appropriate word(s).
In eukaryotic cells, chromosomes are composed of both DNA and proteins
Indicate whether the statement is true or false