Immediately after an action potential passes along an axon, it is not possible to generate a second action potential. Thus, we state that the membrane is briefly _____
A) hyperexcitable
B) refractory
C) fully depolarized
D) above threshold
E) at the equilibrium potential
Answer: B
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The role of a tumor suppressor protein in a cell is to ____
a. promote cell division of healthy cells b. inhibit cell growth and division c. promote cell division of abnormal cells d. trigger DNA replication in preparation for cell division e. serve as a cell receptor for growth factors
An example of an irreversible inhibitor is
A) a competitive inhibitor. B) angiotensin converting enzyme (ACE) inhibiting drugs. C) a noncompetitive inhibitor. D) penicillin. E) isoleucine.
A genomic DNA library is derived from mRNA.
Answer the following statement true (T) or false (F)
Gingivitis is
A. caused by Streptococcus mutans. B. primarily caused by anaerobic oral flora. C. also called NUG. D. erosion of tooth enamel causing a lesion. E. None of the choices are correct.