A transcription factor, Prx1, is essential for forelimb growth in mammals. The forelimbs of mice are legs and the forelimbs of bats are wings
If the enhancer region of Prx1 in mice is replaced with the enhancer region of the bat Prx1, the resulting fore-limbs of the transformed mice are 6% longer than normal. Explain this result.
What will be an ideal response?
ANS:
By changing the enhancer region, the expression of the gene has been changed, resulting in a change in mor-phology.
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Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation
What will be an ideal response?
Which of the following is NOT true of DNA-binding proteins?
a. Many are dimers that combine with two sites on the DNA. b. Regulatory proteins often bind inverted repeats on DNA. c. A leucine zipper is a common domain to maintain proper conformation. d. Most bind to DNA in a nonspecific manner.
Which of the following is most directly associated
with a stimulus? a. integrators b. receptors c. effectors d. central nervous system e. all of these
The semifluid matrix that surrounds organelles in a cell is called the:
A. cytoplasm. B. nucleoplasm. C. ribosome. D. stroma.