What MCAT Enzymes Do I Need to Know?

Apple and vinegar representing MCAT enzymes - image by Magoosh

Curious about the enzyme kinetics MCAT content you’ll find on the Bio/Biochem section? We’ve got you covered! Below is a quick overview of MCAT enzymes to know as well as enzyme classification, features, regulation, and more.

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MCAT Enzymes Features

Here are some key enzyme features:

Cofactors and Coenzymes

Their purpose is to improve enzymatic function.

Cofactors: inorganic molecules, metals ions (Zn+2, Cu+2, Fe3+)

Coenzymes: small, organic, vitamin derivatives (NAD+, FAD, coenzyme A)

Examples:

  • Apoenzymes
  • Holoenzymes
  • Prosthetic groups

Six Enzyme Classifications

Here’s a breakdown of enzyme classification:

Enzyme Activity, Enzyme Kinetics, and Enzyme Regulation

Enzyme kinetics MCAT content can feel a little daunting, so we’ve broken down how activity, kinetics, and regulation are all related below:

Enzyme Regulation: Reversible Inhibition

 CompetitiveNoncompetitiveMixedUncompetitive
Binding SiteActive siteAllosteric siteAllosteric siteAllosteric site
Impact on KmIncreasesUnchangedIncreases or decreasesDecreases
Impact on KmUnchangedDecreasesDecreasesDecreases

A Final Word on MCAT Enzymes Questions

Enzyme content can feel overwhelming as you’re studying, but the key to understanding their more complex activity and regulation lies in first grasping their features and functions. And when you understand the mechanics of enzyme kinetics, you’ll be better able to memorize the Michaelis–Menten equation. Remember, succeeding on this section requires more than just formula memorization.

Happy studying and good luck!

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