Biology Dictionary

  • Mesophyll

    Mesophyll

    The tissue in the leaves of plants where most photosynthesis occurs, typically containing a high concentration of chloroplasts.

  • Mesophyte

    Mesophyte

    A plant that grows in environments with moderate water availability, neither too dry nor too wet.

  • Mesozoic era

    Mesozoic era

    A geologic era that lasted from about 252 to 66 million years ago, marked by the rise and fall of dinosaurs, as well as the appearance of the first birds and mammals.

  • Messenger RNA (mRNA)

    Messenger RNA (mRNA)

    A type of RNA that carries genetic information from DNA to the ribosome, where it is used as a template for protein synthesis.

  • Met

    Met

    Abbreviation for metabolism or metabolic, commonly used in biochemical contexts.

  • Meta-(m-)

    Meta-(m-)

    A prefix used in chemistry to indicate a specific position of substituents on an aromatic ring, referring to the relative position of groups.

  • Metabolic

    Metabolic

    Relating to the chemical processes that occur within a living organism to maintain life, including processes like energy production and nutrient processing.

  • Metabolic pathway

    Metabolic pathway

    A series of interconnected biochemical reactions that occur within a cell to convert one molecule into another, often releasing or storing energy.

  • Meniscus

    Meniscus

    A crescent-shaped cartilage in the knee joint that acts as a cushion and stabilizer. The term can also refer to the curvature of a liquid’s surface in a container.

  • Menopause

    Menopause

    The natural biological process marking the cessation of a woman’s menstrual cycles, typically occurring around age 50.