Question

Select the definition that best describes a coenzyme.

A. an organic molecule that assists with a protein's catalytic function
B. a molecule that has a catalytic biochemical function on a substrate
C. an inorganic ion that aids the biochemical function of a protein
D. a substance acted upon and changed by a catalyst

Answer 1

A coenzyme is an organic molecule that assists with a protein's catalytic function, often derived from vitamins, and enables enzymes to work more efficiently. Option A is correct.

Step-by-step explanation:

The definition that best describes a coenzyme is: A. an organic molecule that assists with a protein's catalytic function. Coenzymes are organic helper molecules that are not consumed in the chemical reaction and therefore are reusable.

These molecules often come from dietary vitamins and they assist enzymes by improving the conformation and function of the enzyme, allowing for more efficient catalysis of reactions.

For instance, Vitamin C acts as a coenzyme for various enzymes that synthesize connective tissue component collagen. An enzyme without its necessary coenzyme is termed an apoenzyme and is inactive, whereas the active form, which includes the coenzyme, is referred to as a holoenzyme.

A coenzyme is an organic molecule that assists with a protein's catalytic function. It is a small organic molecule that binds to an enzyme and helps it carry out its specific reaction. Coenzymes are often derived from vitamins, such as B vitamins. They participate in reactions without being changed themselves and are recycled and reused.