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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Purines pair with pyrimidines.
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C nucleotides pair with A nucleotides.
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Deoxyribose sugars bind with ribose sugars.
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Nucleotides bind with nucleoside triphosphates.
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Detailed explanation-1: -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-2: -The diameter of the DNA double helix is 2 nm and is uniform throughout. Only the pairing between a purine and pyrimidine can explain the uniform diameter.
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: -Answer and Explanation: Purines pair with pyrimidines because they both contain nitrogenous bases which means that both molecules have complementary structures that make up DNA. Purines have a double-ringed structure with a six-membered ring combined with a five-membered ring.
Detailed explanation-5: -Solution : the diameter of the strand is always constant due to a pairing of purine (adenine and guanine) and pyrimidine (cytosine and thymine ). This specific bonding gives uniform width to the DNA.