A DNA nucleotide could contain any of the following EXCEPT:
A
deoxyribose sugar, phosphate, and adenine
B
deoxyribose sugar, phosphate, and nitrogen bases
C
deoxyribose sugar, phosphate, and fatty acids
D
deoxyribose sugar, phosphate, and thymine
C
To determine which of the options contains a DNA nucleotide, we need to understand the components of a DNA nucleotide.
A DNA nucleotide consists of three main parts:
1. Deoxyribose sugar: It is a type of sugar molecule that forms the backbone of DNA. It is a five-carbon sugar.
2. Phosphate: It is a group of atoms consisting of phosphorus and oxygen. Phosphate groups are responsible for linking individual nucleotides together, forming the DNA strand.
3. Nitrogen bases: Nitrogen bases are organic molecules that make up the "rungs" of the DNA ladder. There are four types of nitrogenous bases found in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
Now, let's assess each option:
A) Deoxyribose sugar, phosphate, and adenine: This option contains all the required components of a DNA nucleotide. Adenine is one of the four nitrogen bases found in DNA.
B) Deoxyribose sugar, phosphate, and nitrogen bases: This option also contains all the required components of a DNA nucleotide. Nitrogen bases are essential for DNA's structure and genetic information.
C) Deoxyribose sugar, phosphate, and fatty acids: Fatty acids are not part of a DNA nucleotide. They are molecules composed of long chains of carbon and hydrogen atoms and are not involved in the structure of DNA. Hence, this option can be eliminated.
D) Deoxyribose sugar, phosphate, and thymine: This option contains all the required components of a DNA nucleotide. Thymine is one of the four nitrogen bases found in DNA.
Based on the analysis, the correct answer is C) Deoxyribose sugar, phosphate, and fatty acids because fatty acids are not present in a DNA nucleotide.