Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Chapter 9, Problem 12P
Interpretation Introduction
Interpretation:
An explanation regarding the termination of reaction in which a restriction enzyme cleaves DNA by the addition of EDTA is to be stated.
Concept introduction:
The restriction enzymes are also called as restriction endonucleases. The restriction endonucleases are used for the hydrolysis of the phosphodiester backbone present on the DNA sequence. These restriction enzymes are BamHI obtained from bacillus amyloliquifaciens, SmaI obtained from Serratia marcescens and many others.
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True or False. Topoisomerase I does not require ATP to break and rejoin DNA strands because the energy of the phospho-diester bond is stored transiently in a phospho-tyrosine linkage in the enzyme’s active site. Explain your answer in 2-3 sentences.
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gene. If the JM109 strain is transformed by the PBKSK plasmid, the strain will produce the B-galactosidase (from the lac gene)
and will hydrolyze X-gal to produce the blue compound. Therefore, colonies that were transformed and contain the pBSKS wil
you
appear blue.
IPTG &
X-Gal &
NO colonies
Amp
E. coli JM109
E. coli JM109
50 mM calcium
chloride-15% glycerol
lac
lac
lac
IPTG &
I Recovery
X-Gal
solution at -702C
PBSKS
White colonies
E. coli JM109
E. coli JM109
ampR
amp I
amp
lac
lac
Heat Shock
Non-transformed
42°C
E. coli JM109
E. coli JM109
amps
amps
lac
lac
IPTG &
X-Gal
lac I
Recovery
lac
PBSKS
BLUE colonies
PBSKS
ampRI
(amp
Transformed
IPTG &
X-Gal &
BLUE colonies
Amp
Hypotheses: Circle the correct answer
1. If PBSKS is transformed into JM109 cells, colonies will be (able/not able) to grow in the presence of ampicillin.
a. Why?
_
2. If PBSKS is transformed into JM109 cells, colonies in media with IPTG (will/will not) induce the production the B-
galactosidase enzyme.
a. Why?_
3. If…
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