GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the antiparallel nature
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the semiconservative nature
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uniform width throughout DNA
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uniform length in all DNA
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Detailed explanation-1: -Final answer: c. uniform width throughout DNA.
Detailed explanation-2: -Because purines always bind with pyrimidines – known as complementary pairing – the ratio of the two will always be constant within a DNA molecule. In other words, one strand of DNA will always be an exact complement of the other as far as purines and pyrimidines go.
Detailed explanation-3: -Answer and Explanation: Purine always pairs with pyrimidines due to its structural properties. The structure of purines allows them to make hydrogen bonds with pyrimidines. Adenine bonds with thymine because both have two binding sites, so they make double hydrogen bonds.
Detailed explanation-4: -The diameter of the DNA double helix is uniform throughout because a purine (two rings) always pairs with a pyrimidine (one ring) and their combined lengths are always equal.
Detailed explanation-5: -Purines always bond with pyrimidines by forming hydrogen bonds. The two bases, adenine (A) and guanine (G) are purines while cytosine (C), thymine (T) and uracil (U) are pyrimidines. Adenine always bonds with thymine by two hydrogen bonds (A=T) in a DNA molecule.