Question

A B-DNA molecule has 1 million nucleotide pairs. How many complete turns of the helix are there in this molecule?

   A B-DNA molecule has 1 million nucleotide pairs. How many complete turns of the helix are there in this molecule?

Genetics: A Conceptual Approach

Genetics: A Conceptual Approach

Benjamin Pierce 6th Edition

Chapter 10, Problem 36

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Solved by Expert Wade Corn

09/28/2020

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A B-DNA molecule has 1 million nucleotide pairs. How many complete turns of the helix are there in this molecule?

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Key Concepts

B-DNA Helical Structure

B-DNA is the most prevalent form of DNA in living organisms and is characterized by its right-handed double-helical structure. It has a consistent and measurable geometry, including a specific number of base pairs per complete turn, which is vital for understanding its spatial configuration.

Base Pair

A base pair consists of two nucleotides held together by hydrogen bonds. Base pairs form the rungs of the DNA ladder and are fundamental units in calculating the overall length and helical properties of the DNA molecule.

Helical Turn and Base Pairs per Turn

The concept of a helical turn refers to one complete 360-degree rotation in the DNA helix. The average number of base pairs per turn in B-DNA is a critical measurement that allows one to calculate the number of complete helical turns in a molecule by dividing the total number of nucleotide pairs by this average.

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