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A double helix, or a twisted-ladder shape, is the standard structure of DNA. It consists of two strands of a sugar-phosphate backbone and the nucleotide base pairs adenine, thymine, guanine and cytosine. Adenine pairs wi... More »

www.reference.com Science Biology Molecular Biology & DNA

The structure of DNA was discovered by James Watson and Francis Crick. They published their paper "A Structure for Deoxyribose Nucleic Acid" in April of 1953. In 1962, they won the Nobel Prize in Physiology or Medicine f... More »

www.reference.com Science Biology Molecular Biology & DNA

Each chromosome in the cell nucleus contains DNA compressed to over 10,000 times shorter than it would be if it were to be stretched out. Despite this compression, each chromosome is capable of rapidly unwinding, taking ... More »

www.reference.com Science Biology Molecular Biology & DNA
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Supercoiled DNA is a length of DNA that has been subjected to a twisting stress that has distorted its normal shape. As the twisted ladder of the double helix is twisted beyond its normal state, the torsion forces the DN... More »

www.reference.com Science Biology Molecular Biology & DNA

The structure of DNA was discovered by James Watson and Francis Crick. They published their paper "A Structure for Deoxyribose Nucleic Acid" in April of 1953. In 1962, they won the Nobel Prize in Physiology or Medicine f... More »

www.reference.com Science Biology Molecular Biology & DNA

The electrostatic interactions that occur between histones and DNA provide the energy needed to fold DNA into a compact shape, allowing histones to form a very tight bond. Histones are positively charged proteins, while ... More »

www.reference.com Science Biology Molecular Biology & DNA

To build a simple DNA model, make a double helix shape with beads, their color corresponding to the basic constituents of a DNA molecule: phosphate, sugar and base. Follow the correct order of how the parts of the DNA mo... More »

www.reference.com Science Biology Molecular Biology & DNA