객관식
Which of the following models most accurately represents the structure of DNA?
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14. DNA Synthesis
Discovering the Structure of DNA
객관식
Look at the DNA molecule shown at right. What does it most closely resemble in structure?
A
A branched network
B
A ring-shaped molecule
C
A double helix
D
A single straight chain
검증된 단계별 안내1
Understand the structure of DNA: DNA is composed of two strands that coil around each other, forming a shape known as a double helix. This structure is stabilized by hydrogen bonds between complementary base pairs (adenine-thymine and guanine-cytosine).
Compare the given options to the known structure of DNA: A branched network would imply multiple connections and intersections, which is not characteristic of DNA. DNA is not branched but linear in its double-stranded form.
Evaluate the ring-shaped molecule option: While some DNA molecules in prokaryotes can be circular, the structure of DNA itself is not inherently ring-shaped. The double helix is the defining feature of DNA's structure.
Consider the single straight chain option: DNA is not a single chain; it consists of two complementary strands that twist into a helical shape. A single straight chain does not describe the double-stranded nature of DNA.
Conclude that the correct answer is a double helix: The double helix is the most accurate description of DNA's structure, as it reflects the intertwined, helical arrangement of its two strands.
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