It is thought that President Abraham Lincoln suffered from a genetic disorder known as Marfan syndrome. Which types of fibers are affected in this disorder?
A. collagen fibers
B. hyaline fibers
C. elastic fibers
D. reticular fibers
E. ground fibers
Answer: C
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Among invertebrates, increased speed along the axon is brought about by increasing the
diameter of the axon. Among vertebrates, this same function (increased speed) is brought about by ____________________.
a. insulating the axons with myelin sheath cells b. increasing the number of pumps c. increasing the number of sodium gates d. making axon terminals larger
In males, sterilization involves a vasectomy, which removes a portion of what structure?
A. vas deferens B. epididymis C. seminiferous tubules D. Sertoli cells
A mutation that results in a change in the codon-reading pattern could result from
A) either an insertion or a deletion of a base. B) a base substitution only. C) a base deletion only. D) a base insertion only.
Cell division increases the number of __________ in the body
Fill in the blank(s) with the appropriate word(s).