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Recombinant DNA Technology
Recombinant DNA Technology

... A. Know the gene of interest and the species carrying that gene B. Need a species that can rapidly replicate its DNA and divide C. Need a species containing many restriction sites on its DNA D. Need restriction enzymes—these enzymes are able to cut double stranded DNA molecules at a specific nucleot ...
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1.3. Identity: Molecules and Cells Study Guide
1.3. Identity: Molecules and Cells Study Guide

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SB2a Build DNA using the Nucleotides Then Print
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Nucleic acid double helix



In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA. The double helical structure of a nucleic acid complex arises as a consequence of its secondary structure, and is a fundamental component in determining its tertiary structure. The term entered popular culture with the publication in 1968 of The Double Helix: A Personal Account of the Discovery of the Structure of DNA, by James Watson.The DNA double helix polymer of nucleic acids, held together by nucleotides which base pair together. In B-DNA, the most common double helical structure, the double helix is right-handed with about 10–10.5 base pairs per turn. This translates into about 20-21 nucleotides per turn. The double helix structure of DNA contains a major groove and minor groove. In B-DNA the major groove is wider than the minor groove. Given the difference in widths of the major groove and minor groove, many proteins which bind to B-DNA do so through the wider major groove.
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