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Gene

A unit of inheritance usually occurring at a specific location, or loci, on a chromosome. Physically, a gene is a sequence of DNA bases that specify the order of amino acids in a protein or, in some cases, a small RNA molecule referred to as a microRNA. A gene may be made up of hundreds to thousands of DNA bases. Genes are responsible for hereditary characteristics.

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Industry/Domain: History Category: World history

Macchu Picchu

Inca city, situated high above the Urabamba valley, Peru. It was probably a border outpost or religious center. The city was unknown to the Spanish ...