Question

An enzyme speeds up a chemical reaction in the cell, but can only be used once.
a. True
b. False

Answer 1

This is false.

Enzymes are actually made up by proteins which can act as a biological catalysts that can speed up chemical reactions. Each of them has an active site, its like a concaved space, and it can bind into specific substrates then combine them to form products.

However, active sites will not be changed and they can bind into more substrates again and again. Just note that the active site may only be changed due to the unfavorable temperature or pH, but otherwise they can be used again and again

Answer 2

An enzyme speeds up a chemical reaction in the cell and can be used more than once. The correct option is false.

Enzymes generally speed up chemical reactions in biological systems by providing an alternate but shorter pathway for reactants to reach products. In other words, enzymes lower the activation energy needed to be summoned by reactants in order to get to products.

While enzymes work by speeding up reactions, they are not themselves consumed in reactions. Thus, they can be recycled and reused all over again.

More on enzymes can be found here:  https://brainly.com/question/21248499