Title:

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DNA .

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Type:

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Agriculture .

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in humans, as in other higher organisms, a DNA molecule consists of two strands that wrap around each other to resemble a twisted

ladder whose sides, made of sugar and phosphate molecules, are connected by rungs of nitrogen-containing chemicals called bases.

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Each strand is a linear arrangement of repeating similar units called nucleotides, which are each composed of one sugar, one

phosphate, and a nitrogenous base

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2).

Four different bases are present in DNA adenine (A), thymine (T), cytosine (C), and guanine (G).

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����� ( G guanine ( � ) � C ( Cytosine )

the particular order of the bases arranged along the sugar-phosphate backbone is called the DNA sequence;

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the sequence specifies the exact genetic instructions required to create a particular organism with its own unique traits .

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