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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True
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False
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Detailed explanation-1: -The three-dimensional structure of DNA-the double helix-arises from the chemical and structural features of its two polynucleotide chains.
Detailed explanation-2: -Answer and Explanation: The 3-dimensional structure of DNA is called a double helix because each DNA molecule consists of two chains of nucleotides that are paired along their lengths and twisted into a right-handed helix that resembles a spiral staircase (see below).
Detailed explanation-3: -DNA is made up of four building blocks called nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). The nucleotides attach to each other (A with T, and G with C) to form chemical bonds called base pairs, which connect the two DNA strands.
Detailed explanation-4: -DNA and RNA are composed of nucleotides that are linked to one another in a chain by chemical bonds, called ester bonds, between the sugar base of one nucleotide and the phosphate group of the adjacent nucleotide. The sugar is the 3’ end, and the phosphate is the 5’ end of each nucleiotide.