Recombinant DNA Technology
Knockout mice are created by

mutagenizing a mouse and selecting for mutant offspring
creating a chimera by fusing cells from two different cell lines
transfecting embryonic stem cells with an altered gene sequence
infecting the mouse with a retrovirus

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

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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 expression vector

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

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