Question

1. You have discovered a new plasmid in a species of foul-smelling, sewer-dwelling bacteria. As a first step towards understanding the composition of this pl digest the plasmid with a serie Using agarose gel electrophoresis, you determined the size of each fragment produced in these reactions and listed the result in the table below (8 pts): asmid, you s of restriction enzymes, either alone or in combination. Enzymes(s) Afel Pstl SmalAfel+Afel PAfel + used Pst1 Smal SmalPst+ DNA fragments icut cut produced (in bp Smal 5000 5000 2900 4000 2300 2900 2300 2100 10002100 1700 1700 600 400 600 400 2 cuts A. How large is the plasmid in bp?ia B. Using the circle (plasmid) below, draw a restriction map of the plasmid. Be sure to indicate the distances between adjacent restriction sites (in bp). Plasmic
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Answer #1

a)

ENZYME

PRODUCT

TOTAL

Afe1

5000 bp

5000 bp

Sma1

2900 bp & 2100 bp

5000 bp

Pst1

5000 bp

5000 bp

Hence the plasmid is 5000 bp large.

b) Restriction Map

  • Consider the digestion of Afe1 and Pst1. These are generating two fragments of 4000 bp and 1000 bp
  • Then consider the mixed digestion.
  • The final map:-
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