Dictionary » D » Double helix

Double helix


A conformation or shape describing a structure that typically consists of two matching helices intertwined about a common axis, such as the structure of the DNA molecule, which is made of two linear strands held together in opposite direction through chemical bonds, and which has become twisted into a helix (that is a three-dimensional spiral similar to the shape of a railing on a spiral staircase).


The double-helix model of DNA structure was first conceptualized by James D. Watson and Francis Crick in 1953.

See also: DNA

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Thank you.. But B-DNA is the normal Watson Crick double helix form of DNA isn't it? So it should be the one discovered first right?

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by Sue4
Tue Aug 26, 2014 3:27 am
Forum: Molecular Biology
Topic: B-DNA and A-DNA
Replies: 3
Views: 617

Questions on the Sodium Potassium Pump and Enzymes

... involves two enzymes ie. DNA Gyrase and DNA Helicase in unwinding the double helix or when an enzyme has two jobs such as DNA Polymerase forming phosphodiester bonds between ...

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by JoWillyTso
Mon Nov 05, 2012 5:50 pm
Forum: Cell Biology
Topic: Questions on the Sodium Potassium Pump and Enzymes
Replies: 3
Views: 3789

Re: question for evolutionary biologist.

... molecules that are complementary to a portion of one strand of the DNA double helix. Now what is an enzyme? Guess what? It is a protein. This basic refresher tell us that ...

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by scottie
Sat Aug 25, 2012 10:40 pm
Forum: Evolution
Topic: question for evolutionary biologist.
Replies: 26
Views: 28512

Isolation during transcription

... transcription before the binding you need to bind to the single helix amino acids before the polymerase does You need a technique to do this ... to become immortals be a bit altruistic It took me 25 seconds to double check that i wrote this properly. 50 people died in the world during ...

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by Trenchent
Fri May 04, 2012 8:35 am
Forum: Molecular Biology
Topic: Isolation during transcription
Replies: 2
Views: 1805

Molecular gene (genome) concept scientifically untenable

... one [4]. The elucidation of the structure of DNA as macromolecular double helix by Francis Crick and James Watson in 1953 and in vitro characterization of the process ...

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by PAWahid
Wed May 02, 2012 4:54 am
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 28991
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