Examlex
Which of the following amino acids is a precursor of the pyridine ring portion of NAD?
Control Group
In experimental research, a group of participants that does not receive the experimental treatment, serving as a comparison to evaluate the effect of the treatment.
Cause And Effect
The relationship between events or things, where one is the result of the other or others.
Experimental Method
A research method where variables are manipulated and controlled to determine their effect on other variables.
Independent Variable
In an experiment, the variable that is manipulated or changed by the researcher to observe its effect on the dependent variable.
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