consist of either one or two long chains of repeating units called nucleotides. DNA and RNA are the two main types.

In case of both DNA and RNA, in general it is the nucleotides.

Nucleotides basically consists of three parts. The sugar(deoxyribose in DNA and ribose in RNA, both of which are pentose sugars), nitrogenous base and a phosphoric acid group.

The only component that varies in the nitrogenous base. There are five different types.

1.Adenine(A)

2.Guanine(G)

3.Cytosine(C)

4.Thymine(T)

5.Uracil(U)

1 and 2 are known as purines.

3, 4 and 5 are known as pyrimidines.

In DNA, A base pairs with T by means of a double hydrogen bond and G pairs with C by means of a triple hydrogen bond.

In RNA, A base pairs with U by means of a double hydrogen bond and G pairs with C by means of a triple hydrogen bond.

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

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