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What is a DNA sequence?

Short Answer

Expert verified
A DNA sequence is the specific arrangement of nucleotides (A, T, C, G) along a strand of DNA that encodes the genetic information. For example, GATTACA is a DNA sequence.

Step by step solution

01

Understanding nucleotides

Firstly, it must be understood that a DNA sequence is composed of nucleotides. A nucleotide is the basic building block of DNA and it consists of a sugar molecule (deoxyribose), a phosphate group and a nitrogenous base. There are four types of bases, namely: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
02

Comprehending the DNA structure

DNA is generally described as a double helix, where two DNA strands are connected together forming a structure similar to a twisted ladder. The two strands are connected together using the bases. Each base on one strand is always paired with its complementary base on the other strand, following the base-pairing rules where Adenine pairs with Thymine and Cytosine pairs with Guanine.
03

Identifying a DNA sequence

A DNA sequence is specifically the order in which the four bases appear along a strand of DNA. For instance, GATTACA is a DNA sequence. It must be noted that the order of these bases is what determines the genetic information carried in that part of the DNA.

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