Which is not a trait of enzymes?

Question

a) lower the activation energy of a reaction

(b) can be used in many different chemical reactions

(c) involved in but not changed by the reaction

(d) allow chemical reactions to occur at moderate temperatures

Answer 1

B.  Enzymes are very specific as to what they will work with - usually only one thing.

Enzymes catalyze (help it along) a reaction by lowering the amount of energy needed to cause a reaction or the temperature (the most common catalyst) needed.  By definition, enzymes are involved it but are not changed by the reaction.

Answer 2

Enzymes are biomolecules that catalyze (i.e. increase the rates of) chemical reactions, in other words it is biological catalyst which speed up reaction. Almost all enzymes are proteins. Like all catalysts, enzymes work by lowering the activation energy (Ea or ΔG‡) for a reaction, thus dramatically increasing the rate of the reaction. Most enzyme reaction rates are millions of times faster than those of comparable uncatalyzed reactions. As with all catalysts, enzymes are not consumed by the reactions they catalyze, nor do they alter the equilibrium of these reactions.

Enzyme activity can be affected by other molecules. Inhibitors are molecules that decrease enzyme activity; activators are molecules that increase activity. Many drugs and poisons are enzyme inhibitors. Activity is also affected by temperature, chemical environment (e.g. pH), and the concentration of substrate.

Some enzymes are used commercially, for example, in the synthesis of antibiotics. In addition, some household products use enzymes to speed up biochemical reactions (e.g., enzymes in biological washing powders break down protein or fat stains on clothes; enzymes in meat tenderizers break down proteins, making the meat easier to chew).  

The answer is (b) - can be used in many different chemical reactions.

Answer 3

Enzymes are biological catalysts. A catalyst does all of the above, except for the fact that one catalyst only works for one type of reaction, and that goes for enzymes too. One enzyme is suited for one reaction. The answer is B.

Answer 4

(b) can be used in many different chemical reactions