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In living organisms, DNA does not usually exist as a single molecule, but instead as a pair of molecules that are held tightly together.[14][15] These two long strands entwine like vines, in the shape of a double helix.

This may be obvious, but alcohol creates bad judgement and I have known too many women who have said yes to coming to my home after a few drinks.

A gene is a unit of heredity and is a region of DNA that influences a particular characteristic in an organism.

Genes contain an open reading frame that can be transcribed, and regulatory sequences such as promoters and enhancers, which control transcription of the open reading frame.

This arrangement of two nucleotides binding together across the double helix is called a base pair.

As hydrogen bonds are not covalent, they can be broken and rejoined relatively easily.

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