Blocking potassium ion channels in a mammalian cell membrane would __________.
A) increase the resting potential
B) decrease the magnitude of the membrane potential
C) decrease sodium's equilibrium potential
D) increase the magnitude of the membrane potential
E) increase potassium's equilibrium potential
Answer: B) decrease the magnitude of the membrane potential
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An example of a phenotypic trait where observation of phenotype can easily identify the genetic variation is:
A. color markings in certain invertebrates. B. human skin color. C. human blood type. D. color markings in certain invertebrates and human blood type. E. human skin color and blood type.
Action potential propagation is the fastest in ____
a. a myelinated axon with a small diameter b. an unmyelinated axon with a small diameter c. a myelinated axon with a large diameter d. an unmyelinated axon with a large diameter e. all myelinated axons regardless of diameter
Transcription of the XIST gene results in ________
a. an active X chromosome b. carpel formation in Arabidopsis thaliana c. stamen formation in Arabidopsis thaliana d. a Barr body
Which one of the following statements describes the process through which a primary RNA transcript becomes a functional mRNA?
A) Sections of the primary transcript called exons are removed, and the sections that remain are spliced together. B) Sections of RNA called exons are added to the primary transcript. C) A primary transcript needs no editing and is immediately ready to function as mRNA. D) Noncoding sections of the primary transcript, called introns, are removed, and the remaining coding sections, called exons, are spliced together. E) Random sections of the primary transcript called exons are replaced with sections called introns.