Multiple Choice
Which of the following types of DNA is characterized by a left-handed helix?
7. DNA and Chromosome Structure
Alternative DNA Forms
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Which of the following types of DNA is the most common DNA form?
A
A-DNA
B
B-DNA
C
C-DNA
D
D-DNA
Verified step by step guidance1
Understand the different forms of DNA: A-DNA, B-DNA, C-DNA, and D-DNA. Each form has distinct structural characteristics.
Recognize that B-DNA is the most common form of DNA found in nature. It is the form that is most prevalent in living organisms under physiological conditions.
B-DNA is characterized by its right-handed helix and has about 10.5 base pairs per turn. It is the form that is typically found in the cells of organisms.
A-DNA, C-DNA, and D-DNA are less common forms. A-DNA is a right-handed helix but is shorter and wider than B-DNA, often found in dehydrated samples. C-DNA and D-DNA are even less common and are not typically found under normal biological conditions.
When asked about the most common form of DNA, B-DNA is the correct answer due to its prevalence in living cells and its structural stability under physiological conditions.
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