Nadia, who is 25 years old, wants to be taller because she is just 5 feet tall. Of the choices given, which would be the wisest option for Nadia?
A) Take thyroxine daily.
B) Use GHRH so she will have her own natural growth.
C) Take injections of growth hormone.
D) Do nothing.
Answer: D
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The production of leukocytes is regulated by
A. erythropoietin. B. colony-stimulating factor. C. prolactin. D. folic acid. E. rennin.
The development of hypertension in humans is associated with
A. obesity. B. smoking. C. age. D. kidney disease. E. All of the choices for this question are correct.
All the following are true of companion cells EXCEPT that they
A) cooperate with sieve-tube elements in conducting sugar-rich solutions. B) are connected to sieve-tube elements via plasmodesmata. C) supply materials to repair the plasma membrane of sieve-tube elements. D) provide proteins and ATP to sieve-tube elements. E) fuse together to form the sieve plates of sieve-tube elements.
Which of the following is not an essential step in homologous recombination?
A) exonuclease degradation B) branch migration C) strand displacement D) duplex separation E) endonuclease nicking