Which of the following best describes the basis for separation of DNA fragments during agarose gel electrophoresis?
A. The smallest fragments will migrate fastest.
B. The fragments with the highest percentage of A and T will migrate fastest.
C. The fragments with the highest percentage of G and C will migrate fastest.
D. The largest fragments will migrate fastest.
Answer: A
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Regardless of the exact approach taken to recombinant DNA technology, one of the keys to successful cloning is choosing the right vector.
Answer the following statement true (T) or false (F)
After meals
a. the pancreas secretes glucagon. b. liver cells take up glucose and produce glycogen. c. the brain continues to receive adequate glucose. d. fatty-acid conversions supply about half of the ATP needed by muscle and liver cells. e. all of these occur.
One of the pyrimidine bases in a DNA molecule is adenine
__________________ Indicate whether the statement is true or false.
Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.
A. postzygotic, mechanical B. postzygotic, ecological C. prezygotic, gamete fusion D. prezygotic, behavioral E. prezygotic, temporal