Multiple Choice
A nucleotide of DNA may contain which of the following?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, what is the name of the “twisted ladder” shape of the DNA molecule?
A
Double helix
B
Single-stranded coil
C
Alpha helix
D
Beta-pleated sheet
Verified step by step guidance1
Understand that the question is asking about the specific three-dimensional shape of the DNA molecule.
Recall that DNA is composed of two strands that wind around each other, forming a structure often described as a 'twisted ladder.'
Recognize that this characteristic shape is known as the 'double helix,' where 'double' refers to the two strands and 'helix' refers to the spiral or twisted shape.
Differentiate this from other structures such as 'single-stranded coil' (which would imply only one strand), 'alpha helix,' and 'beta-pleated sheet,' which are shapes found in proteins, not DNA.
Conclude that the correct name for the 'twisted ladder' shape of DNA is the 'double helix.'
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