The ____ is the initial opening between the developing gut and the outside environment for most animal embryos
a. schizocoelom
b. mesoglea
c. archenteron
d. enterocoelom
e. blastopore
ANSWER: e
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The function of a helix-turn-helix motif in a transcription factor is to
A) recruit RNA polymerase. B) form dimers with other transcription factors. C) bind a specific sequence in the major groove of DNA. D) unwind the double helix.
If the pH of a solution is decreased from 7 to 6, it means that the:
a. concentration of the H+ has decreased to 1/10 of what it was b. concentration of the H+ has increased to 10 times what it was c. concentration of OH- has increased to 10 times what it was d. concentration of the OH- has increased by 1/7 of what it was e. solution has become more basic
Strains of Mycobacterium tuberculosis designated as (BCG/MDR/XDR) strains are resistant in vitro to three or more antitubercular drugs in addition to isoniazid and rifampin. (Be sure to use uppercase letters in your answer.)
What will be an ideal response?
What is the in-use test, and why is it more useful than other methods of evaluating disinfectants?
What will be an ideal response?