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ChemistryReaction rates and empirical rate laws

Reaction rate measures change over time; a rate law describes its dependence under specified conditions.

MethodChemistryCatalysis and equilibrium

A catalyst changes the reaction pathway and rate, while preserving the equilibrium constant for the same reaction.

ModelBiologyCells as units of life

Cell theory describes the organization and reproduction of cellular life.

ModelBiologyDNA and sequence information

DNA's base sequence stores biological information.

DefinitionBiologyGene expression

Gene expression produces functional RNA or protein from gene information.

DefinitionBiologyDNA replication

Complementary base pairing allows DNA strands to serve as copying templates.

ModelBiologyCell cycle, mitosis and cytokinesis

DNA duplication, nuclear division and cytoplasmic division are distinct events in a typical mitotic cycle.

ModelBiologyMeiosis and chromosome segregation

Typical diploid meiosis halves the number of chromosome sets through two divisions after one DNA replication.

ModelBiologyAlleles and Mendelian segregation

A diploid individual's paired alleles can segregate into gametes.

ModelBiologyBiological evolution

Evolution concerns inherited change across generations.

DefinitionBiologyNatural selection

Heritable variation can change through differences in reproductive contribution.

ModelBiologyGenetic drift

Chance can change allele frequencies independently of an adaptive advantage.

ModelBiologyCommon ancestry and branching lineages

Evolutionary relationships describe descent from shared ancestors.

ModelBiology · ChemistryMetabolism and chemical pathways

Metabolism comprises the regulated chemical reactions of living systems.

DefinitionBiologyOxygenic photosynthesis

Oxygenic photosynthesis couples light-energy capture to carbon fixation and releases oxygen from water.

ModelBiologyAerobic cellular respiration

Aerobic respiration couples nutrient oxidation to ATP production, using oxygen as the final electron acceptor.

ModelBiologyMembranes and transport

Selective membranes and transport proteins regulate movement between a cell and its surroundings.

ModelBiologyEcology and ecosystems

Ecology examines organisms' interactions with one another and their physical environment.

DefinitionBiologyHomeostasis and negative feedback

Feedback can maintain internal variables within functional ranges.

ModelEarth & cosmosRock cycle and geological transformation

Rock materials can change through multiple geological pathways.

ModelEarth & cosmosPlate tectonics

Moving lithospheric plates organize many large-scale geological processes.

ModelEarth & cosmosEarth's water cycle

Water moves among reservoirs above, on and below Earth's surface.

ModelEarth & cosmos · Biology · ChemistryEarth's carbon cycle

Carbon moves through biological, oceanic, atmospheric and geological reservoirs.

ModelEarth & cosmosPlanetary radiative energy balance

Earth's energy storage changes when incoming and outgoing energy differ.

ModelEarth & cosmosAtmospheric greenhouse effect

Infrared absorption and emission affect how Earth loses heat to space.

ModelEarth & cosmosWeather, climate and their time scales

Weather describes short-term conditions; climate describes their longer-term patterns.

DefinitionEarth & cosmosOrbits as gravitational motion

An orbiting body can remain in continuous gravitational free fall.

ModelEarth & cosmosStellar fusion and evolution

Main-sequence stars release energy by fusing hydrogen into helium.

ModelEarth & cosmosHot Big Bang and the cosmic microwave background

Expansion and relic radiation support an earlier hot, dense Universe.

ModelMathematics & logicFirst-order predicates and quantifiers

Quantifiers bind variables over a specified domain.

Definition
ModelSource checked

DNA replication

Biology

Complementary base pairing allows DNA strands to serve as copying templates.

Key knowledge

In semiconservative replication of double-stranded DNA, each parental strand serves as a template for a new complementary strand. Each resulting double helix contains one parental strand and one newly synthesized strand.

Conditions and scope

  • This describes ordinary cellular double-stranded DNA replication; detailed enzymes and viral replication strategies are outside scope.
  • Copying is not infallible: proofreading and repair correct many errors, while uncorrected changes can become mutations.
Sources · 3

References

Sources retain their recorded scope. A source link alone does not establish verification of every statement.

  1. Mary Ann Clark, Matthew Douglas and Jung Choi — OpenStax, Rice University2 sources
    1. Biology 2e, 14.3: Basics of DNA ReplicationMary Ann Clark, Matthew Douglas and Jung Choi — OpenStax, Rice UniversityTextbook chapteropenstax.orgRead source
    2. Biology 2e, 14.6 DNA RepairMary Ann Clark, Matthew Douglas and Jung Choi — OpenStax, Rice UniversityTextbook chapteropenstax.orgRead source
  2. Biology XII: Molecular Basis of InheritanceNCERTTextbook chapter · PDFncert.gov.inRead source

Evidence and review

Textbook account of the semiconservative model, Meselson–Stahl observations and error correction; those experiments were not repeated.

2026-10-10 · English template/strand distinction checked against section 14.3 and the bounded copying-error qualification against section 14.6.

Foundational review

2026-10-10 · Fresh primary-source inspection of the complete compact record, including every statement, equation, quantity and material condition, followed by independent AI editorial review. This check does not certify all linked lessons or every passage of every cited publication.

Sources from other places

Agreement within this scope

Semiconservative template copying and one old/new strand per daughter helix.

Copying mechanism and copying accuracy are separate questions.

  • NCERT

    • Biology XII: Molecular Basis of Inheritance
      IndiaEnglish

      §5.1.1, printed pp80–82: DNA/RNA backbone and base pairing; §5.4, printed pp88–90: semiconservative replication; §5.5.2–5.5.3, printed pp92–95: transcription and RNA products; §5.7, printed pp98–100: translation and activated amino acids

Related reference entries

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Showing 1–4 of 4 relationships

Scientific relationships · 4 / 4

The relationship type describes the connection. Its linked statements, sources and conditions define the scope.

  1. Related to
    Relationship sources · 1

    Linked statements

    • In semiconservative replication of double-stranded DNA, each parental strand serves as a template for a new complementary strand. Each resulting double helix contains one parental strand and one newly synthesized strand.
    • DNA is a nucleic acid whose sequence of bases carries genetic information. In the usual double helix, sugar-phosphate backbones support bases paired A with T and C with G. DNA sequence can specify protein or functional RNA products.

    Complementary DNA strands serve as templates in semiconservative copying.

  2. Related to
    Relationship sources · 1

    Linked statements

    • In semiconservative replication of double-stranded DNA, each parental strand serves as a template for a new complementary strand. Each resulting double helix contains one parental strand and one newly synthesized strand.
    • In a typical mitotic eukaryotic cell cycle, nuclear DNA is replicated during S phase before mitosis separates sister chromatids into daughter nuclei. Cytokinesis usually divides the cytoplasm into daughter cells. Mitosis and cytokinesis are distinct processes.

    Nuclear DNA replication precedes mitosis in the typical mitotic eukaryotic cell cycle.

  3. Related to
    Relationship sources · 1

    Linked statements

    • A mutation is a change in DNA sequence. It can arise during replication or from other processes that alter DNA. Whether a mutation enters subsequent generations depends on the affected cell lineage and the organism's route of reproduction.

    Replication can introduce DNA-sequence changes; it is not the sole mutation source.

  4. Related to
    Relationship sources · 1

    Linked statements

    • Replicative DNA polymerases extend a primer's 3′ end while copying a template, synthesizing DNA 5′→3′. Helicase opens the duplex, primase supplies primers, topoisomerases relieve torsional stress and ligase joins processed fragments. Opposite template orientations require continuous leading-strand and discontinuous lagging-strand synthesis at a typical fork.

    This supplies the machinery behind semiconservative replication.

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bio-dna-replication
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core.1
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Essential core · first collection