QuestionAugust 9, 2025

The pairing of __ is responsible for the diameter of a DNA double helix pentose to pyrimidine purine to pyrimidine pentose to purine

The pairing of __ is responsible for the diameter of a DNA double helix pentose to pyrimidine purine to pyrimidine pentose to purine
The pairing of __ is responsible for the diameter of a DNA double helix
pentose to pyrimidine
purine to pyrimidine
pentose to purine

Solution
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Answer

purine to pyrimidine Explanation 1. Identify DNA Structure Components DNA is composed of nucleotides, each containing a sugar (pentose), a phosphate group, and a nitrogenous base. 2. Determine Base Pairing In DNA, the bases pair specifically: adenine (a purine) pairs with thymine (a pyrimidine), and guanine (a purine) pairs with cytosine (a pyrimidine). 3. Relate Base Pairing to Helix Diameter The consistent pairing of one purine with one pyrimidine maintains a uniform diameter of the DNA double helix.

Explanation

1. Identify DNA Structure Components<br /> DNA is composed of nucleotides, each containing a sugar (pentose), a phosphate group, and a nitrogenous base.<br /><br />2. Determine Base Pairing<br /> In DNA, the bases pair specifically: adenine (a purine) pairs with thymine (a pyrimidine), and guanine (a purine) pairs with cytosine (a pyrimidine).<br /><br />3. Relate Base Pairing to Helix Diameter<br /> The consistent pairing of one purine with one pyrimidine maintains a uniform diameter of the DNA double helix.
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