Deoxyribonucleic acid – DNA

Deoxyribonucleic acid – DNA

1. DNA is a nucleic acid.
2. It contains the genetic instructions of all known living organisms.
3. DNA segments are called genes.
4. It consists of two polymers (long) of simple units called nucleotides.
5. The wide of DNA chain is 22 to 26 Ångströms
6. DNA polymer is a very large molecule which contains millions of nucleotide.
7.The sugar in DNA (2-deoxyribose) are joined together by phosphate groups.
8. DNA strand is made from alternating phosphate and sugar residues.
9. Each single strand of DNA is a chain of four types of nucleotides
10. Nucleotide is triphosphate deoxyribonucleoside.
11. Four types of nucleotides are adenine, cytosine, guanine, and thymine.