Q4 of 71 Page 36

The fact that a purine base always pairs through hydrogen bonds with a pyrimidine base in the DNA double helix leads to:

Due to paring of the purine base (adenine and guanine) and pyrimidine base (cytosine and thymine) by hydrogen bonds the diameter of the DNA remains constant, leading to uniform width throughout the DNA.

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A nucleoside differs from a nucleotide. It lacks the:

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Both deoxyribose and ribose belong to a class of sugars called:

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The net electric charge on DNA and histones is:

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The promoter site and the terminator site for transcription are located at: