Which system relies on the contraction of smooth muscle to propel luminal contents?
a. digestive
b. sensory
c. respiratory
d. nervous
e. endocrine
ANSWER: a
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Which of the following steps is the third step of the mating-type switch mechanism?
A. A 3' single-stranded overhang is created. B. The MAT locus is cleaved by a specific nuclease to create a double-stranded break. C. Strand invasion of HMLa or HML? is mediated by Rad51. D. As the 3' invading end is extended by DNA polymerase, the HML locus information is copied, whereas the MAT gene information is degraded. E. When the extension has proceeded far enough, it dissociates and reanneals to its original strand.
Which of the following does not increase the level of nutrients available to crop plants?
A. adding humus to the soil B. crop rotation C. plowing crop residues under D. applying herbicides E. applying chemical fertilizers
Explain the effect of high altitude on breathing control
What will be an ideal response?
In this representation of transcription, the first
genetic word of RNA is
a. ATG. b. ATA. c. UAU. d. GUG. e. AUG.