Multiple Choice
In DNA structure, what is the name of the “twisted ladder” shape of the DNA molecule?
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
Verified step by step guidance1
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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