Which of the following statements about enzymes is (are) true?

Question

I. Enzymes are proteins. II. An enzyme increases the activation energy of a chemical reaction. III. Enzymes speed up chemical reactions.

Answer 1

Enzymes are catalytic proteins that speed up a reaction by lowering the activation energy needed to begin the reaction.
For this reason, statements I and III are true, and statement II is false.
Hope this helps!

Answer 2

I is true

generally speaking II is false - enzymes DECREASE the activation energy of a chemical reaction, making it more likely to occur

III is true mostly as well

Answer 3

I and III are true.

All enzyme are proteins. That's just a fact.

II is wrong. Enzymes decrease the energy of activation by orienting the substrates/reactants is a position such that they are more likely to undergo a reaction.

By orienting substrates such, enzymes speed up the reactions.

Answer 4

I. most cases are ture, because one additional class is not account for: ribozyme
II. enzyme catalize reaction which reduces free energy
III.most cases are ture, but sometimes it governs reaction to go certain way which may not go faster necessary because it might just prevent a faster reaction in order to accomplish a slower reaction

Answer 5

yep !!! and my cars speed up when i react to the gas pedal, so what else is new ?