BIO 203: Exam 1 With Complete Solutions
Questions And Answers
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Neuronal Action Potentials
a. It is not possible to generate an action potential during the relative
refractory period.
b. The absolute refractory period occurs because voltage-gated K+
channels are in the inactivated conformation.
,c. The relative refractory period occurs immediately after the absolute
refractory period.
d. Both a) and b) are correct and c) is incorrect
e. Statements a), b) and c) are all correct - Answer c. The relative
refractory period occurs immediately after the absolute refractory
period.
Consider two compartments, A and B, separated by a membrane
permeable only to water. Compartment A contains 250 mM KCl, and
compartment B contains 500 mM glucose.
a. Over time, there is net movement of water from compartment A to
compartment B
b. Compartment B is hyperosmotic relative to compartment A
c. There is no net movement of water
d. Both a) and b) are correct and c) is incorrect
, e. Statements a), b) and c) are all correct - Answer c. There is no net
movement of water
Osmolarity and tonicity
Assume the following aqueous solutions:
Solution A: 0.4 M Urea + 0.4M Glucose
Solution B: 0.2 M KCl + 0.4M NaCl
Solution C: 0.1 M NaCl + 0.4M Sucrose
Solution D: 0.4 M Sucrose
a. Solution C is hypoosmotic with respect to solution B.
b. A red blood cell placed in solution D would shrink.
c. Solution B is hyperosmotic with respect to solution A.
d. Both a) and b) are correct and c) is incorrect
Questions And Answers
EMAIL ME FOR MORE INFO :
Neuronal Action Potentials
a. It is not possible to generate an action potential during the relative
refractory period.
b. The absolute refractory period occurs because voltage-gated K+
channels are in the inactivated conformation.
,c. The relative refractory period occurs immediately after the absolute
refractory period.
d. Both a) and b) are correct and c) is incorrect
e. Statements a), b) and c) are all correct - Answer c. The relative
refractory period occurs immediately after the absolute refractory
period.
Consider two compartments, A and B, separated by a membrane
permeable only to water. Compartment A contains 250 mM KCl, and
compartment B contains 500 mM glucose.
a. Over time, there is net movement of water from compartment A to
compartment B
b. Compartment B is hyperosmotic relative to compartment A
c. There is no net movement of water
d. Both a) and b) are correct and c) is incorrect
, e. Statements a), b) and c) are all correct - Answer c. There is no net
movement of water
Osmolarity and tonicity
Assume the following aqueous solutions:
Solution A: 0.4 M Urea + 0.4M Glucose
Solution B: 0.2 M KCl + 0.4M NaCl
Solution C: 0.1 M NaCl + 0.4M Sucrose
Solution D: 0.4 M Sucrose
a. Solution C is hypoosmotic with respect to solution B.
b. A red blood cell placed in solution D would shrink.
c. Solution B is hyperosmotic with respect to solution A.
d. Both a) and b) are correct and c) is incorrect
