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RNA and the Origins of Life definitions

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  • RNA
    A molecule capable of folding into complex 3D shapes, storing genetic information, and catalyzing chemical reactions essential for early life.
  • Ribozyme
    A catalytic RNA molecule that accelerates chemical reactions, demonstrating RNA's enzymatic capabilities in primitive life forms.
  • 3D Structure
    A spatial conformation formed by RNA, enabling diverse functions such as catalysis and environmental responsiveness.
  • Genetic Information
    Encoded sequences within nucleic acids that determine heredity and guide the formation and replication of biological molecules.
  • Polynucleotide Chain
    A linear sequence of nucleotides in RNA or DNA, serving as the backbone for storing and transmitting genetic codes.
  • Conformational Change
    A structural shift in RNA induced by binding small molecules or other RNAs, allowing adaptation to environmental signals.
  • Pre-RNA World
    A hypothesized early stage featuring simpler RNA-like molecules capable of catalysis before true RNA emerged.
  • RNA World
    An evolutionary phase where RNA dominated, acting as both genetic material and catalyst within primitive cellular compartments.
  • DNA World
    A stage in evolution where DNA became the primary, stable repository for genetic information, replacing RNA's role.
  • Membrane Bilayer
    A simple double-layered structure that enclosed early catalytic RNAs, enabling compartmentalization in primitive cells.
  • Self-Replication
    The process by which RNA molecules produce copies of themselves, crucial for sustaining early life forms.
  • Deoxyribose
    A sugar component of DNA, more complex to synthesize than ribose, contributing to DNA's enhanced stability.
  • Ribose
    A sugar found in RNA, simpler to produce than deoxyribose, facilitating RNA's early emergence in evolution.
  • Catalysis
    The acceleration of chemical reactions, a function performed by certain RNA molecules before the evolution of protein enzymes.
  • Compartmentalization
    The separation of chemical reactions within membrane-bound spaces, allowing distinct evolutionary processes in early cells.