DNA పొడవు ఎంత ? DNA అంటే ఎంటి ? | what is dna explaned in telugu | r star tv

DNA పొడవు ఎంత ? DNA అంటే ఎంటి ? | what is dna explaned in telugu | r star tv

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The two DNA strands are known as polynucleotides as they are composed of simpler monomeric units called nucleotides.Each nucleotide is composed of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group. The nucleotides are joined to one another in a chain by covalent bonds (known as the phosphodiester linkage) between the sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone. The nitrogenous bases of the two separate polynucleotide strands are bound together, according to base pairing rules (A with T and C with G), with hydrogen bonds to make double-stranded DNA. The complementary nitrogenous bases are divided into two groups, pyrimidines and purines. In DNA, the pyrimidines are thymine and cytosine; the purines are adenine and guanine.