DNA STRUCTURE AND REPLICATION

DNA is usually a double-helix and has two strands running in opposite directions. Each chain is made of subunits called nucleotides. Each strand has a backbone made up of deoxy-ribose sugar molecules (5 sugars) linked together by phosphate groups. Each sugar molecule is covalently linked to one of four possible bases, Adenine, Guanine, Cytosine and Thymine. A and G are larger molecules (called purines) and C and T are smaller molecules (called pyrimidines). In the DNA, …

…C). Two strands of DNA are obtained from one, having produced two daughter molecules which are identical to one another and to the parent molecule. BIBLIOGRAPHY http://www.pbs.org/wgbh/aso/databank/entries/do53dn.html http://www.accessexcellence.org/AB/BC/Rosalind_Franklin.html http://www.pbs.org/wgbh/aso/databank/entries/bofran.html http://www.pbs.org/wgbh/aso/databank/entries/bofran.html http://www.accessexcellence.org/AB/GG/dna_replicating.html