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Question

A typical genomic library consists of DNA fragments about
  1. 10 kb
  2. 15 kb
  3. 20 kb
  4. 40 kb

A
10 kb
B
20 kb
C
15 kb
D
40 kb
Solution
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A collection of clones that includes all the DNA sequences of a given species is called as a genomic DNA library. Most DNA cloning is done with E. coli plasmid vectors because of the relative simplicity of the cloning procedure. Clones carrying 20 kb DNA fragments are required to represent the total human haploid genome, which contains 3109 base pairs.
Thus, the correct answer is option C.

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