A cell is isolated, and electrophysiology studies reveal that the resting membrane potential is ?70
millivolts. The predominant intracellular ion is Na+, and the predominant extracellular ion is K+.
With voltage change, which of the following would result in an action potential?
Correct Answer:
b. Na+ rushing into the cell
· Question 2
When a patient asks what causes cystic fibrosis, how should the nurse respond? Cystic fibrosis is
caused by an _____ gene.
Answer
Correct Answer:
d. Autosomal recessive
· Question 3
What is the diagnosis of a 13-year-old female who has a karyotype that reveals an absent
homologous X chromosome with only a single X chromosome present? Her features include a
short stature, widely spaced nipples, reduced carrying angle at the elbow, and sparse body hair.
,Correct Answer:
c. Turner syndrome
Question 4
How are potassium and sodium transported across plasma membranes?
Correct Answer:
c. By adenosine triphosphate enzyme (ATPase)
· Question 5
The ion transporter that moves Na+ and Ca2+ simultaneously in the same direction is an example
of which of the following types of transport?
Correct Answer:
d. Symport
· Question 6
An aide asks the nurse why people who have neurofibromatosis will show varying degrees of the
disease. Which genetic principle should the nurse explain to the aide?
Correct Answer:
, b.
Expressivity
· Question 7
A nurse is reviewing the pedigree chart. When checking for a proband, what is the nurse looking
for?
Correct Answer:
a.
The person who is first diagnosed with a genetic disease
· Question 8
The nurse would be correct in identifying the predominant extracellular cation as:
Correct Answer:
a.
Sodium
·
Question 9
, A 13-year-old girl has a karyotype that reveals an absent homologous X chromosome with only a
single X chromosome present. What medical diagnosis will the nurse observe on the chart?
Correct Answer:
c.
Turner syndrome
· Question 10
A patient who has diarrhea receives a hypertonic saline solution intravenously to replace the
sodium and chloride lost in the stool. What effect will this fluid replacement have on cells?
Correct Answer:
c.
Cells will shrink.
· Question 11
Which of the following mutations have the most significant effect on protein synthesis?
Correct Answer:
d.
Frameshift mutations
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