molecular genetics

• DNA


  A double helix comprising two strands of anti-parallel polynucleotides, each nucleotide formed of a deoxyribose sugar, a phosphate group and one of four different bases, adenine, cytosine, thymine and guanine
• Gene

  • A segment of DNA, made of a sequence of nucleotides, which controls the production of a particular polypeptide
  • A unit of inheritance
  • Born on a locus of chromosomes
• Chromosome

  • A molecule of DNA is wrapped around proteins to form a single chromatin thread
  • During cell division, this chromatin thread coils more tightly to form chromosomes in the cell nucleus
• DNA contains genetic information
• Chromatin thread

  Chromatin threads condense to form chromosomes before cell division
• Gene

  A small segment of the DNA molecule with a specific nucleotide sequence that controls the production of a polypeptide
• DNA is important to regulate cellular processes
• DNA molecule

  Two strands that are twisted to form a double helix structure
• DNA molecule

  A long strand of DNA molecule is coiled around proteins to form a chromatin thread