객관식
In DNA structure, what is the name of the “twisted ladder” shape of the DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the context of DNA structure, which of the following components is NOT found in DNA?
A
Phosphate group
B
Thymine
C
Uracil
D
Deoxyribose sugar
검증된 단계별 안내1
Step 1: Understand the basic components of DNA. DNA is composed of a sugar-phosphate backbone and nitrogenous bases attached to the sugar.
Step 2: Identify the sugar in DNA. DNA contains deoxyribose sugar, which is a five-carbon sugar lacking one oxygen atom compared to ribose.
Step 3: Recognize the nitrogenous bases in DNA. DNA contains four bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
Step 4: Compare the bases in DNA and RNA. RNA contains uracil (U) instead of thymine, so uracil is not found in DNA.
Step 5: Conclude that among the given options, uracil is the component NOT found in DNA because it is specific to RNA.
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