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Helical Formations of DNA definitions

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  • Supercoiling
    A state where the DNA helix twists upon itself, increasing tension and potentially interfering with replication and gene expression.
  • Topoisomerase
    An enzyme that manages DNA supercoiling by introducing breaks to relieve torsional strain and allow normal cellular processes.
  • Type I Topoisomerase
    A variant of an enzyme that creates single-strand breaks in DNA to relax supercoiling and reduce tension.
  • Type II Topoisomerase
    A variant of an enzyme that introduces double-strand breaks in DNA, efficiently relieving supercoiling.
  • DNA Denaturation
    The process where hydrogen bonds between DNA strands are disrupted, causing strand separation, often by heat, pH, or UV.
  • Renaturation
    The rejoining of separated DNA strands, restoring the double helix structure after denaturation.
  • Hydrogen Bond
    A weak interaction between complementary bases in DNA, crucial for holding the double helix together.
  • Melting Temperature
    The specific temperature at which DNA strands separate, influenced by base composition, especially GC content.
  • GC Content
    The proportion of guanine-cytosine base pairs in DNA, which increases the stability and melting temperature of the helix.
  • Circular DNA
    A DNA molecule with a closed-loop structure, often found in prokaryotes and subject to supercoiling.
  • Double Helix
    The characteristic twisted-ladder structure formed by two complementary DNA strands.
  • Replication
    A cellular process requiring relaxed DNA, during which the genetic material is duplicated.
  • Gene Expression
    A process dependent on accessible DNA, where genetic information is used to synthesize functional products.
  • Base Pair
    A unit consisting of two nucleotides on opposite DNA strands, connected by hydrogen bonds, such as AT or GC.