What system is used for excision repair in E. coli, what are its components, and what do they specifically do in the process?
What will be an ideal response?
Ans: Excision repair in E. coli is done by the uvr system. A combination of the proteins UvrA and UvrB recognizes DNA damage, upon which UvrA dissociates and UvrC attaches. UvrBC has endonuclease activity to remove a portion of the damaged strand. UvrD is a helicase that unwinds the DNA to allow the excised strand to be removed.
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A person with an autosomal recessive disorder generally has how many copies of the dominant allele?
a) Two, on the X chromosome b) Two c) Zero d) Two, on the Y chromosome e) One
Explain the idea of transgenic animals as "bioreactors."
What will be an ideal response?
Why might some women bodybuilders who are taking illegal steroids (testosterone-like compounds) be in greater danger of going bald than other women?
What will be an ideal response?
Which two processes are responsible for the shape of the curve at Time B?
1. transduction 2. entry of single-stranded Hfr DNA 3. rolling circle replication of single-stranded Hfr DNA 4. activation of DNA pumps in plasma membrane A) 1 and 2 B) 1 and 4 C) 2 and 3 D) 3 and 4