Which of the following is not true of the imprinting of the mammalian gene for insulin growth factor-2 (IGF-2)?
A. CTCF binds to the methylated IGF2 gene insulator.
B. IGF2 gene is activated when the insulator is methylated.
C. The maternally inherited copy of IGF2 is normally repressed in egg cells.
D. The insulator of both the paternal and maternal IGF2 alleles lies between the promoter and the enhancer.
A
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A rapidly growing population is indicated by
a. A. b. B. c. C. d. D. e. none of these.
Three codons in the genetic code do not code for amino acids. Their function is to serve as
____________________ codons, which signal the ____________________ of protein synthesis. Fill in the blank(s) with the appropriate word(s).
The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will
A. also break down starch in the stomach, which has a pH of 2. B. be able to break down proteins to amino acids in the stomach. C. be able to break down starch in a test tube. It doesn't need to be in the mouth. D. only work at body temperature.
How does the size of a DNA fragment relate to its speed of passage through the agarose gel?
What will be an ideal response?