The Meselson and Stahl experiment provided conclusive evidence for the semiconservative replication of DNA in E. coli. What pattern of bands would occur in a CsCl gradient for conservative replication?
What will be an ideal response?
After one generation in the 14N, there would be two bands, one heavy and one light (no intermediate). After the second generation in the 14N, there would also be two bands, one heavy and one light (no intermediate).
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Which of the following would be the best strategy to prevent the spread of yellow fever and dengue fever into the southern United States?
A) mosquito avoidance and eradication B) vaccination C) monitoring bird populations D) tick avoidance
DNA and RNA are alike in
a. the pentose sugar. b. all the nitrogenous bases used to assemble the genetic code. c. the number of strands. d. their function in genetics. e. none of these.
The ________ number, or n, is the number of chromosomes contained in the nuclei of gametes, the nonsomatic cells
Fill in the blank(s) with correct word
Which chemical, contained in the granules of basophils, helps prevent blood clot formation?
a. histamine b. leukotrienes c. prostaglandins d. heparin
e. SRS-A