Nitrogen fixation is the process by which gaseous nitrogen is converted to nitrate
____________________ Indicate whether the statement is true or false.
F, ammonia
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Which of the following is true about two-dimensional gel electrophoresis?
A. The first dimension separates proteins based on their size. B. The second dimension separates proteins based on their isoelectric point (pI). C. The first dimension separates proteins based on their density. D. The second dimension separates proteins based on their size. E. The second dimension separates proteins based on their charge.
What is the equation relating flow to resistance and a pressure gradient?
A) flow = pressure × resistance B) flow = pressure gradient / resistance C) flow/resistance = 1/pressure gradient D) flow × resistance = 1/pressure gradient E) flow × resistance = pressure × gradient
What is the smallest number of nucleotides that must be added or subtracted to change the triplet grouping of the genetic message?
A) one B) two C) three D) four
Two closely related populations of mice have been separated for a long period by a river. Climatic change causes the river to dry up, thereby bringing the mice populations back into contact in a zone of overlap. Which of the following is not a possible outcome when they meet?
A) They interbreed freely and produce fertile hybrid offspring. B) They no longer attempt to interbreed. C) They interbreed in the region of overlap, producing an inferior hybrid. Subsequent interbreeding between inferior hybrids produces progressively superior hybrids over several generations. D) They remain separate in the extremes of their ranges but develop a hybrid zone in the area of overlap. E) They interbreed in the region of overlap, but produce sterile offspring.