Once DNA is separated on a gel, it is often desirable to gain some idea of its informational content. How might this be done?
What will be an ideal response?
A Southern blot is designed to literally "blot" electrophoresed DNA from a gel onto a supporting medium, usually nitrocellulose or nylon. The medium is placed directly on the gel, and a transfer buffer is drawn through the gel carrying the DNA to the medium. Once the medium is dried and the DNA denatured, it can be "probed" to determine the location and amount of complementary DNA. Southern blots are used to identify particular DNA locations and amounts often from complex mixtures of DNA fragments.
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Consider the data in Fig. 46.8 illustrating the age structure of France and India. In many parts of the world, the average age of reproductive maturity is increasing as humans move from urban to rural environments
Suppose that the current average age of first reproduction is 15 years in India and 20 years in France. How would a 5-year increase in the average age of reproductive maturity in both countries be expected to affect the per capita birth rate, and would this effect be greater in France or in India? A. increase in per capita birth rate, greater effect in India B. increase in per capita birth rate, greater effect in France C. decrease in per capita birth rate, greater effect in India D. decrease in per capita birth rate, greater effect in France
The flower structure that consists of the male reproductive parts is the
A. carpel. B. stigma. C. corolla. D. calyx. E. stamen.
Consider a glucose molecule that is completely oxidized during the process of cellular respiration. What is
the correct sequence in the series of reactions? I. glycolysis II. phosphorylation III. Krebs cycle
a. I >>> II >>> III b. I >>> III >>> II c. II >>> I >>> III d. II >>> III >>> I e. III >>> I >>> II
A pollen grain coat is composed of which of the following?
a. sporopollenin b. cellulose c. peptidoglycan d. exopolysaccharides e. integuments