Scelta multipla
Which components form the sides (backbone) of the DNA ladder?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following best describes the shape of a DNA molecule?
A
Linear strand
B
Double helix
C
Triple helix
D
Beta sheet
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Recall the fundamental structure of DNA as discovered by Watson and Crick, which is characterized by two strands twisted around each other.
Understand that the term 'double helix' refers to this twisted ladder-like shape formed by two complementary strands of nucleotides.
Recognize that 'linear strand' would describe a single, uncoiled strand, which does not capture the full 3D structure of DNA.
Note that 'triple helix' is not a common or stable form of DNA under normal biological conditions.
Identify that 'beta sheet' is a term used to describe a protein secondary structure, not DNA.
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