| 单词 | enzyme |
| 释义 | enzyme[ en-zahym ] / ˈɛn zaɪm / SEE SYNONYMS FOR enzyme ON THESAURUS.COM noun Biochemistry.any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion. Compare -ase. Origin of enzyme1880–85; <Medieval Greek énzymos leavened (Greek en-en-2 + zȳ́m(ē) leaven + -os adj. suffix) Words nearby enzymeEnzed, enzootic, enzootic stability, enzygotic, enzymatic, enzyme, enzyme-inhibition theory of narcosis, enzyme-linked immunosorbent assay, enzymology, enzymolysis, enzymopathy Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for enzymeBritish Dictionary definitions for enzymeenzyme / (ˈɛnzaɪm) / nounany of a group of complex proteins or conjugated proteins that are produced by living cells and act as catalysts in specific biochemical reactions Derived forms of enzymeenzymatic (ˌɛnzaɪˈmætɪk, -zɪ-) or enzymic (ɛnˈzaɪmɪk, -ˈzɪm-), adjectiveWord Origin for enzymeC19: from Medieval Greek enzumos leavened, from Greek en- ² + zumē leaven Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for enzymeenzyme [ (en-zeyem) ] A protein molecule that helps other organic molecules (see also organic molecule) enter into chemical reactions with one another but is itself unaffected by these reactions. In other words, enzymes act as catalysts for organic biochemical reactions. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for enzymeenzyme [ ĕn′zīm ] n.Any of numerous proteins or conjugated proteins produced by living organisms and functioning as specialized catalysts for biochemical reactions. Other words from enzymeen′zy•mat′ic (-zə-măt′ĭk) null adj.The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for enzymeenzyme [ ĕn′zīm ] Any of numerous proteins produced in living cells that accelerate or catalyze the metabolic processes of an organism. Enzymes are usually very selective in the molecules that they act upon, called substrates, often reacting with only a single substrate. The substrate binds to the enzyme at a location called the active site just before the reaction catalyzed by the enzyme takes place. Enzymes can speed up chemical reactions by up to a millionfold, but only function within a narrow temperature and pH range, outside of which they can lose their structure and become denatured. Enzymes are involved in such processes as the breaking down of the large protein, starch, and fat molecules in food into smaller molecules during digestion, the joining together of nucleotides into strands of DNA, and the addition of a phosphate group to ADP to form ATP. The names of enzymes usually end in the suffix -ase. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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