BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Controlling variables is important because slight variations in the experimental set-up could strongly affect the outcome being measured.

Detailed explanation-2: -In a “controlled experiment”, why must all of the variables, except one, be kept constant throughout the experiment? If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results.

Detailed explanation-3: -A failure to isolate the controlled variables will compromise the internal validity. Most experimental designs measures only one or two variables at a time. Any other factor, which could potentially influence the results, must be correctly controlled.

Detailed explanation-4: -While the independent and dependent variables are the most commonly discussed variables in research, other variables can influence outcomes. These include confounding, extraneous, control, and moderator variables.