Describe nucleotides.

Nucleotides are the basic unit of nucleic acids. It has three components which are chemically distinct :

(1) Nitrogen containing ring organic compound or heterocyclic compound. It can be adenine, guanine, cytosine, thymine (in DNA), uracil (in RNA).

(2) A pentose sugar. The pentose sugar is ribose in case of RNA and 2' deoxyribose in case of DNA.

(3) A molecule of phosphoric acid.

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Give two examples of proteins which transport materials.

What are the basic units of :
(1) DNA (2) RNA ?

What are macromolecules ? Give examples.

What is meant by a primary structure of a nucleic acid ?

Biomolecules