What is the normal length of a poly(A) tail?
a) about 100 adenosine residues
b) about 500 adenosine residues
c) about 700 adenosine residues
d) about 1000 adenosine residues
Ans: b) about 500 adenosine residues
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Taxol, a drug treatment for breast and ovarian cancer, was isolated from ____
a. frog skin b. vascular cambium of a tree c. roots of a tree d. insects e. primates
Which two of the following statements regarding the continuation phase of infection are true?
a. this is the fifth stage of infection b. the continuation phase is generally over within a few days c. Not all infections have this phase d. this is the third stage of infection
Ion concentration differences produce an action potential creating a signal. The difference between a weak signal and an intense signal is
A. weak stimuli only open sodium gates, strong signal also open potassium gates. B. the frequency at which an axon fires. C. the action potential is graduated and a weak signal causes a small change in polarity. D. a strong signal does not allow repolarization but sends a constant flow of ions. E. All of the choices are correct.