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Integrated Programme Sec 2 SBGE, LSS Biology Module Topic
Integrated Programme Sec 2 SBGE, LSS Biology Module Topic

... o Usually capitalised letters are used to represent the dominant trait o Lower case letters are used to represent the recessive trait o PP then represents alleles carrying two copies of dominant gene for colour of flower  Phenotype expressed as dominant trait ...
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... True/False (1 point each) 20. ___T___ Satellite DNA is highly repetitive 21. ___T___ The more repetitive DNA included in a genome, the more quickly it will reanneal after being denatured. 22. ___T___ For most diploid eukaryotic organisms, sexual reproduction is the only mechanism resulting in new me ...
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this certificate as PDF

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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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