DNA

• DNA


  A remarkable molecule found in all prokaryotic and eukaryotic cells (in the nucleus)
• DNA structure


  • Consists of two polynucleotide chains that coil around each other, forming a double helix
  • Each chain is composed of simpler units called nucleotides
  • A nucleotide consists of a nitrogen-containing nucleobase, a phosphate group, and the nucleotides link together via covalent bonds, creating an alternating sugar-phosphate backbone
• Base pairing


  • Adenine pairs with thymine (A-T), cytosine pairs with guanine (C-G)
  • These complementary base pairs hold the two DNA strands together, all bonded by hydrogen bonds
• DNA function


  • Carries genetic instructions for an organism's development, functioning, growth, and reproduction
  • A blueprint of life