How do you describe a structure of a DNA molecule?

Answer 1

A double helix of two strands of DNA linked together with sugar-phosphate backbones with bases on the inside.

Answer 2

surgar-phosphate back bone with bases on the inside. Apex

Answer 3

Which best describes the structure of a DNA molecule?

Answer 4

A molecule of DNA is double-stranded. The molecule has the shape of a double helix, typically right handed(B form DNA).

The DNA molecule consists of two complementary strands oriented in an antiparallel fashion. Each strand is composed of nucleotides. A nucleotide consists of a base (a purine or pyrimidine), a sugar (between the other two components) named deoxyribose, and a phosphate group. Nucleotides are linked to each other via phosphodiester bonds, forming a sugar-phosphate backbone to each strand.

The base of each nucleotide projects into the interior cavity of the helix. Each base is opposite another base: adenine (a purine) is always paired with thymine (a pyrimidine), and guanine (purine) with cytosine (pyrimidine); this phenomenon is called complementary base pairing.

Each nucleotide forms hydrogen bonds with its complementary base on the other strand. Two hydrogen bonds form between adenine and thymine; three hydrogen bonds form between guanine and cytosine.

There are three forms of DNA that differ significantly. The most common, B form, is the structure most people have heard of. It consists of the right handed double helix, with a large "major groove" and a smaller but accessible "minor groove". These 'grooves' are spaces between the backbone which allow access to the bases for interactions with proteins. A form DNA is also a right handed helix, but as yet has not been found in organisms, and only exists in synthetic environments. It has a wider, flatter structure. Z form DNA is found in living organisms, but is a left handed helix, meaning it twists in the opposite direction. Unlike A and B form DNA, the major and minor grooves have very similar sizes in Z form DNA.

The twisted laddermetaphorA DNA molecule is often likened to a spiral (or twisted) ladder. In this analogy, the rungs of the ladder are the base pairs ( A-T and G-C). The sides of the ladder are the sugar-phosphate backbones of the two strands. This refers to B form DNA. History of the double helix modelIn an article published in the journal Nature on 25 April 1953, James D Watson and Francis H Crick proposed the double helix structure for DNA. Watson and Crick used unpublished information obtained empirically by Maurice Wilkins and Rosalind Franklin. In 1962 Crick, Watson, and Wilkins shared the Nobel Prize for Physiology or Medicine; Rosalind Franklin had died in 1958.

Answer 5

a DNA molecule is made up of a phosphate, sugar and base

A double Helix Strand

Answer 6

a DNA molecule is made up of a phosphate, sugar and base

Answer 7

It is spiral shaped object also known as a stepping ladder and is your genes.

Answer 8

Double Helix
Double helix structure