Recombinant DNA Technology
Both DNA gel electrophoresis and SDS-PAGE of proteins are similar because

All of these
in both cases molecules migrate to the anode
both techniques rely on a constant charge to mass ratio
both techniques utilize the sieving properties of gels

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Recombinant DNA Technology
A human cDNA library

cannot be used to obtain human genes because it would be radioactive
contains DNA for virtually all of the human proteins in vectors
contains DNA for specific human proteins
None of these

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Recombinant DNA Technology
An example of a restriction fragment length polymorphism is

All of these
cystic fibrosis results from a three base deletion in most cases but in other cases, other mutations are involved
an Eco RI cuts DNA at a different sequence than Hind III
different length fragments of DNA resulting from loss or gain of a restriction site

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