Examlex
Many enzyme-catalyzed reactions that transfer a phosphate from one molecule to another utilize a histidine residue in the active site of the enzyme. The histidine participates in covalent catalysis by performing a nucleophilic attack on a phosphate, forming an intermediate phosphohistidine (the phosphate covalently attached to the histidine residue). Using ATP as the phosphate donor, show the reaction to form the phosphohistidine intermediate-you do not have to show arrow pushing.
Independent Variable
In an experimental setup, the variable that is manipulated by the researcher to examine its effect on the dependent variable.
Confounded Variable
A factor other than the independent variable that might cause or influence the outcome of an experiment, potentially biasing the results.
Operational Definition
A description of a concept or variable in terms of the specific process or set of validation tests used to determine its presence and quantity.
Hypothesis
A proposed explanation for a phenomenon, intended to be tested through research.
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