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Dictionary » D » Double helix

Double helix

Definition

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).


Supplement

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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Re: Structure of Chromosomes

... instance I would say that it is the totality of all bonded atoms of the double helix that make DNA a single molecule.

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by bobc2
Sat Sep 05, 2009 3:16 am
 
Forum: Molecular Biology
Topic: Structure of Chromosomes
Replies: 4
Views: 26

Re: Structure of Chromosomes

... appreciate you clearing up my confusion over the extent of the DNA double helix as it relates to the chromosomes.

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by bobc2
Fri Sep 04, 2009 7:30 pm
 
Forum: Molecular Biology
Topic: Structure of Chromosomes
Replies: 4
Views: 26

Structure of Chromosomes

... 92 separate DNA molecules. Your first explanation is correct but 1 double helix of DNA is strictly speaking composed of 2 DNA molecules attached by hydrogen bonds (and ...

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by canalon
Fri Sep 04, 2009 7:02 pm
 
Forum: Molecular Biology
Topic: Structure of Chromosomes
Replies: 4
Views: 26

Central Dogma of Molecular Biology

... by Francis Crick in 1958. Crick was also the man who discovered the double helix structure of DNA, with James Watson, in 1953. The conversion of DNA to mRNA is transcription, ...

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by JosePR
Sat Apr 25, 2009 8:53 pm
 
Forum: Molecular Biology
Topic: Central Dogma of Molecular Biology
Replies: 3
Views: 1059

DNA transission and photosynthesis processes

... located in a skool on our capital coastland and wanted 2 know wat a helix in a double stranded nucleic acid is and also the the name of th organellese fluid medium in which ...

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by docsolo
Fri Apr 24, 2009 11:26 am
 
Forum: Cell Biology
Topic: DNA transission and photosynthesis processes
Replies: 0
Views: 203
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