What is DNA Class 9?
Deoxyribonucleic acid is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. DNA and ribonucleic acid are nucleic acids.
What is the major hallmark of double helix model?
A double helix resembles a twisted ladder. Each ‘upright’ pole of the ladder is formed from a backbone of alternating sugar and phosphate groups. Each DNA base? (adenine, cytosine, guanine, thymine) is attached to the backbone and these bases form the rungs.
How are DNA molecules arranged in the double helix?
DNA molecules arrange themselves in a model called the DNA double helix. It’s a 3-D structure that is stored in the nucleus of all cells. Remember that the phosphate and sugar molecules are the backbones of the ladder. The bases (A, G, C, G) form the rungs of the ladder. The two-sided ladder formation of the double-helix DNA structure. Source
Why was the discovery of the double helix so important?
Its true significance became apparent, and its circulation widened, only towards the end of the 1950s, when the structure of DNA they had proposed was shown to provide a mechanism for controlling protein synthesis, and when their conclusions were confirmed in the laboratory by Matthew Meselson, Arthur Kornberg, and others.
How is the double helix a cultural icon?
The double helix has not only reshaped biology, it has become a cultural icon, represented in sculpture, visual art, jewelry, and toys.
Is the 6on Deoxyribose Nucleic acid compatible with experimental data?
The previously published X-ray data5,6on deoxyribose nucleic acid are insufficient for a rigorous test of our structure. So far as we can tell, it is roughly compatible with the experimental data, but it must be regarded as unproved until it has been checked against more exact results.
