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The pair of chains has a radius of 10 ångströms (1.0 nanometre).Although each individual nucleotide repeating unit is very small, DNA polymers can be very large molecules containing millions to hundreds of millions of nucleotides.The sugar in DNA is 2-deoxyribose, which is a pentose (five-carbon) sugar.The sugars are joined together by phosphate groups that form phosphodiester bonds between the third and fifth carbon atoms of adjacent sugar rings.In all species it is composed of two helical chains, bound to each other by hydrogen bonds.
The nucleotide contains both a segment of the backbone of the molecule (which holds the chain together) and a nucleobase (which interacts with the other DNA strand in the helix).The complementary nitrogenous bases are divided into two groups, pyrimidines and purines.In a DNA molecule, the pyrimidines are thymine and cytosine, the purines are adenine and guanine. The DNA backbone is resistant to cleavage, and both strands of the double-stranded structure store the same biological information.So, take a stroll down memory lane to remember all of our past Word of the Year selections.DNA) is a molecule that carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
The two strands of DNA run in opposite directions to each other and are thus antiparallel.