Both an activator and a repressor are bound to the lac operon. What effect will this have on lac transcription?
a. increase
b. decrease
c. prevent
d. no effect
c. prevent
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A. C3 B. C4 C. Desert D. Arctic
In bacteria living next to hot deep sea vents the usual electron donors are?
A. Carbon compounds B. Iron atoms C. Copper ions D. Sulfur compounds
Which of the bone development lineages is incorrect?
A. white blood cell progenitors ? monocytes ? osteoclast B. undifferentiated mesenchymal cells ? osteocyte ? osteoblast C. undifferentiated mesenchymal cells ? fibroblast ? collagen D. undifferentiated mesenchymal cells ? chondroblast ? chondrocyte E. undifferentiated mesenchymal cells ? osteoblast ? osteocyte
The major process regulating phosphorus availability for net primary production is the internal cycling of phosphorus from
A) organic to inorganic forms. B) inorganic to organic forms. C) atmospheric fixation. D) rock weathering.