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enzyme    音标拼音: ['ɛnz,ɑɪm]
n. 酶

□

enzyme
n 1: any of several complex proteins that are produced by cells
and act as catalysts in specific biochemical reactions

enzyme \en"zyme\ ([e^]n"z[imac]m), n. [Pref. en- (Gr. 'en in)
Gr. zy`mh leaven.] (Physiol. Chem.)
A protein produced by a living organism, capable of
catalyzing a chemical reaction. Almost all processes in
living organisms require some form of enzyme to cause the
reactions to occur at a rate sufficient to support life.
There are a very wide variety of enzymes, each specifically
catalyzing a different chemical reaction, the sum of which
cause the bulk of the physiological changes observed as life
processes. Enzymes, like most proteins, are synthesized by
the protein-synthetic mechanism of the living cell, at
special sites on ribosomes, using the genetic information in
messenger RNA transcribed from the genetic instructions
stored as nuleotide sequences in the DNA (or in some viruses,
the RNA) of the genome. Some examples of enzymes are: pepsin,
diastase, rennet, DNA polymerase, invertase, glucose oxidase,
protease, and ribonuclease. There are many other types of
enzyme.
[1913 Webster PJC]

Note: The 1913 Webster defined an enzyme as:
An unorganized or unformed ferment, in distinction from
an organized or living ferment; a soluble, or chemical,
ferment.
[PJC]

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  • Enzyme - Wikipedia
    An enzyme is a biological macromolecule, usually a protein, that acts as a biological catalyst, accelerating chemical reactions without being consumed in the process The molecules on which enzymes act are called substrates, which are converted into products
  • Enzyme | Definition, Mechanisms, Nomenclature | Britannica
    Enzyme, a catalyst that regulates the rate at which chemical reactions proceed in living organisms without itself being altered in the process Most critically, enzymes catalyze all aspects of cell metabolism
  • Enzymes – Definition, Examples, Function
    Enzymes are specialized proteins (and in some cases RNA molecules) that act as catalysts in living organisms They speed up the chemical reactions required for life by lowering the activation energy, all without being consumed in the process
  • Enzyme - National Human Genome Research Institute
    The enzyme is not destroyed during the reaction and is used over and over A cell contains thousands of different types of enzyme molecules, each specific to a particular chemical reaction
  • 8. 2: Enzyme Structure and Function - Biology LibreTexts
    Enzymes lower the activation energy by binding to the reactant molecules and holding them in such a way as to speed up the reaction The chemical reactants to which an enzyme binds are called substrates, and the location within the enzyme where the substrate binds is called the enzyme’s active site
  • What are enzymes? And what do they do? - USA TODAY
    Enzymes are specialized proteins that speed up chemical reactions inside a living organism Without them, most of the chemical reactions in your body wouldn't happen "or would occur too slowly to
  • Enzymes - Definition, Structure, Classification, Examples
    Enzymes are biological molecules that act as catalysts, speeding up chemical responses in living organisms They work by lowering the activation energy needed for a response to do, therefore adding the rate of the response without being consumed themselves
  • Enzymes - Student Academic Success - Monash University
    Enzymes are biological catalysts that speed up chemical reactions in cells, while coenzymes are non-protein molecules that assist enzymes by transporting chemical groups or electrons during these reactions Use this page to revise the following concepts of enzymes:
  • 4. 6 Enzymes – Human Biology - Open Textbook Library
    4 6 Enzymes A substance that helps a chemical reaction to occur is a catalyst, and the special molecules that catalyze biochemical reactions are enzymes Almost all enzymes are proteins, comprised of amino acid chains Enzymes facilitate chemical reactions by binding to the reactant molecules, and holding them in such a way as to make the chemical bond-breaking and bond-forming processes take





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