Recombinant DNA Technology
Isoschizomers recognize

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

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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

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
mutagenized copies of a gene
PCR-amplified variable numbers of tandem repeats (VNTRs)

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Recombinant DNA Technology
The order for the construction of a cDNA fragment from mRNA is to

treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dC, treat with DNA polymerase and bind oligo-dT
digest with RNase, add G residues to the 3' end, treat with reverse transcriptase, add G residues to the 3' end and treat with DNA polymerase
bind oligo-dT, treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dC, treat with DNA polymerase
bind oligo-dC, treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dT and treat with DNA polymerase

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Recombinant DNA Technology
An expression vector

always contains DNA segments for the regulation of mRNA production
always contains an origin of replication
All of these
usually contains a gene that confers antibiotic resistance to the bacterial host

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