Four nucleotides
Further Explanation:
Four nucleotides are present in a typical DNA sequence. DNA consists of a five-carbon sugar molecule, phosphate molecule, and a nitrogenous base. The nucleotide present in a DNA sequence is consists of four nitrogenous bases, which are thymine (T), cytosine (C), adenine (A), and guanine (G).
There are two different groups of bases which are purines and pyrimidines. Cytosine and thymine are pyrimidines having a six-member ring. Adenine and guanine are purines , which is a double ring consists of one five-member ring and one six-member ring. The sequence of nucleotides in the DNA segment encodes the genetic information possessed by DNA. Adenine always binds with thymine, and guanine bonds with cytosine. This arrangement is called complementary base pairing. The bases are bonded together through hydrogen bonds. Two hydrogen bonds are formed between adenine and thymine, whereas three hydrogen bonds are formed between cytosine and thymine. These hydrogen bonds are broken when the DNA replication starts.
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Answer Details:
Grade: High school
Subject: Biology
Chapter: Genetics
Keywords:
Nucleotides, four, DNA, sugar, phosphate, thymine, cytosine, guanine, adenine, hydrogen bonds