Which of the following statements is true of enzymes?
A)Required nonprotein cofactors generally alter the substrate specificity of enzymes.
B)Enzyme function is generally increased if the three-dimensional conformation of an enzyme is altered.
C)Enzyme function is generally independent of physical and chemical environmental factors such as pH and temperature.
D)Enzymes generally increase the rate of chemical reactions by lowering activation energy barriers.

Question

Quizplus · Accepted Answer

Enzymes generally increase the rate of chemical reactions by lowering activation energy barriers. This is achieved through the enzyme's active site, which binds to the substrate and helps to facilitate the reaction. Enzyme activity can be affected by physical and chemical environmental factors, such as pH and temperature, but this does not necessarily mean that enzyme function is independent of these factors. Some enzymes also require nonprotein cofactors, which can either enhance or alter the enzyme's substrate specificity. However, this is not a universal requirement for all enzymes. Altering the three-dimensional conformation of an enzyme can also have varying effects on enzyme function, depending on the specific enzyme and the nature of the conformational change.

Which of the Following Statements Is True of Enzymes