THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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double helix
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sugar-phosphate backbone
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nucleotide polymer
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contains adenine-uracil pairs
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Detailed explanation-1: -Its nucleotide bases contain adenine, uracil, cytosine, and guanine. Therefore, the answer is D. It is because DNA does not contain adenine and uracil pairs.
Detailed explanation-2: -Answer and Explanation: The correct option: The structure which is not true for a DNA molecule is B. Single-stranded.
Detailed explanation-3: -Definition. A unit of two bases in a molecule of DNA or RNA. In DNA, adenine always pairs with thymine (A-T), and guanine always pairs with cytosine (G-C). RNA is the same, except that adenine always pairs with uracil (A-U).
Detailed explanation-4: -The statement that is not true about DNA is that DNA contains adenine, guanine, cytosine, and uracil.
Detailed explanation-5: -Uracil is one of four nitrogen bases, most frequently found in normal RNA. Uracyl can be found also in DNA as a result of enzymatic or non-enzymatic deamination of cytosine as well as misincorporation of dUMP instead of dTMP during DNA replication.