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Module 1: Cromosomas y las instrucciones de codificación

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XSIQ
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Biology - Genes

Genes

The general structure of a nucleotide

A gene [1] is a functional section of the DNA [2] of a chromosome [3] that
codes for the production of a particular protein. DNA is composed of units
called nucleotides, [4] which themselves are composed of sub-units: a sugar
molecule (deoxyribose), a phosphate group, and one of four nitrogen bases.

The nucleotides in a single strand of DNA are linked together by means of
chemical bonds between the phosphate group of one nucleotide and the ribose
sugar of the next. In this way, a polynucleotide chain or backbone of ...
_-ribose-phosphate-ribose-phosphate-ribose-phosphate -_ ... is formed with
the bases attached to each ribose sugar. A complementary strand of DNA
bonds to the first strand according to the base-pairing rule: A of one
strand with T of the other (held by 2 hydrogen bonds), and C and G (held by
3 hydrogen bonds), making a twisted or spiral double helix.

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Links:
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[1] http://alison.com/#
[2] http://alison.com/#
[3] http://alison.com/#
[4] http://alison.com/#