An Introduction to Genetic Engineering by Dr Desmond S. T. Nicholl

By Dr Desmond S. T. Nicholl

Des Nicholl provides a brand new, absolutely revised, and elevated version of his well known undergraduate-level textbook. The publication keeps some of the gains of the unique variation and nonetheless deals a concise technical creation to the topic of genetic engineering. it's divided into 3 major sections: easy molecular biology, equipment of gene manipulation, and smooth functions of genetic engineering. purposes lined within the publication comprise genomics, protein engineering, gene remedy, cloning, transgenic animals and vegetation and bioethics. An creation to Genetic Engineering is vital studying for undergraduate scholars of biotechnology, genetics, molecular biology, and biochemistry.

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Reproduced with permission. indicate the type of nucleic acid template that the enzyme uses. Thus a DNAdependent DNA polymerase copies DNA into DNA, an RNA-dependent DNA polymerase copies RNA into DNA, and a DNA-dependent RNA polymerase transcribes DNA into RNA. These enzymes synthesise nucleic acids by joining together nucleotides whose bases are complementary to the template strand bases. The synthesis proceeds in a 5Ј→3Ј direction, as each subsequent nucleotide addition requires a free 3Ј-OH group for the formation of the phosphodiester bond.

Transcription therefore occurs within the nucleus, and is separated from the site of translation, which is in the cytoplasm. The picture is complicated further by the presence of genetic information in mitochondria (plant and animal cells) and chloroplasts (plant cells only), which have their own separate genomes that specify many of the components required by these organelles. This compartmentalisation has important consequences for regulation, both genetic and metabolic, and thus gene structure and function in eukaryotes is more complex than in prokaryotes.

The DNA to be labelled is denatured by heating, and the oligonucleotide primers annealed to the single stranded DNAs. 2) can then synthesise a copy of the template, primed from the 3Јhydroxyl group of the oligonucleotide. If a labelled dNTP is incorporated, DNA of very high specific activity is produced (Fig. 4). 32 Working with nucleic acids Fig. 3. Labelling DNA by nick translation. (a) A single-strand nick is introduced into the phosphodiester backbone of a DNA fragment using DNase I. (b) DNA polymerase I then synthesises a copy of the template strand, degrading the nontemplate strand with its 5Ј→3Ј exonuclease activity.

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