Question

They don't add energy; the enzyme isn't altered during the reaction.

A) True
B) False
C) Enzymes provide energy
D) Enzymes change their structure during reactions

Answer 1

Enzymes act as biological catalysts to speed up reactions by lowering activation energy without being consumed or permanently altered, maintaining their structure post-reaction.

Step-by-step explanation:

Enzymes are biological catalysts that speed up chemical reactions in the body by lowering the activation energy without being consumed or altered by the reaction. These proteins bind to specific substrates to form an enzyme-substrate complex which helps to lower the activation energy required for the reaction to take place. Enzymes do not provide energy to the reactions nor do they change the free energy (ΔG), meaning they do not alter the overall spontaneity (exergonic) or non-spontaneity (endergonic) of a reaction. After the reaction is complete, the enzymes return to their original state, ready to catalyze new reactions.

Enzymes lower the activation energy of chemical reactions but do not alter the reaction's free energy. They facilitate reactions by binding to the reactant molecules and holding them in such a way that bond-breaking and bond-forming processes become easier. Enzymes are not consumed by the reactions they catalyze and they do not provide energy. Additionally, enzymes remain unchanged by the reaction and can participate in other reactions.