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
Some genetic diseases cannot be diagnosed by changes in restriction sites. Some of these can be detected by allele-specific oligonucleotide probes. These are

mutagenized copies of a gene
copies of the gene with an altered sequence so that a restriction site is inserted
short sequences that will hybridize only to a specific base sequence
PCR-amplified variable numbers of tandem repeats (VNTRs)

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Recombinant DNA Technology
Isoschizomers recognize

same recognition sequence but different recognition site
different recognition site and different recognition sequence
same recognition site and recognition sequence
same recognition site and different recognition sequence

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