why dna is helical but not a straight ladder in structure
Answers
Answer:
in order to further prevent the nitrogenous bases from coming into contact with cell fluid, the molecule twists to reduce space between the nitrogenous bases and the phosphateand sugar strands. The fact that the twoDNA strands that form the double helix are anti-parallel helps to twist the molecule as well.
Answer:
In this arrangement, neighbouring atoms bump into each other. To avoid bumping into each other, the staircase has to twist a little bit. This turns our staircase into a spiral staircase. This extra twist at the end is the reason for the helical shape. In order to further prevent the nitrogenous bases from coming into contact with cell fluid, the molecule twists to reduce space between the nitrogenous bases and the phosphate and sugar strands. The fact that the two DNA strands that form the double helix are anti-parallel helps to twist the molecule as well.
Explanation:
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