Multiple Choice
Which type of weak bond holds the complementary bases together in the DNA double helix?
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7. DNA and Chromosome Structure
DNA Structure
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the structure of B-form DNA, how many base pairs make up one complete turn of the double helix?
A
12
B
10
C
6
D
8
Verified step by step guidance1
Recall that B-form DNA is the most common DNA conformation under physiological conditions and has a characteristic helical structure.
Understand that one complete turn of the B-form DNA helix corresponds to the length along the DNA axis where the helix makes a full 360-degree twist.
Know that the number of base pairs per turn is a key structural parameter and is experimentally determined through X-ray crystallography and other biophysical methods.
Remember that in B-form DNA, the number of base pairs per complete turn is approximately 10, meaning the helix makes one full twist every 10 base pairs.
Therefore, the answer to how many base pairs make up one complete turn of B-form DNA is 10 base pairs.
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