BIO NMDCAT

When substrate is abundant, all enzyme molecules can function at maximum capacity, making enzyme concentration the principal variable.

Each enzyme has unique active-site residues whose catalytic function depends on a specific protonation state.

Increasing substrate concentration increases the likelihood that substrate molecules encounter enzyme active sites.

Up to the optimum temperature, increased molecular motion enhances effective collisions. Above the optimum, denaturation becomes the dominant effect.

Changes in pH alter the ionization of amino acid side chains, affecting substrate binding and catalytic function.

Additional enzyme molecules remain unused if substrate molecules are limiting.

Successful collisions between enzyme and substrate are essential for enzyme-substrate complex formation.

Denaturation changes the tertiary structure, destroying the active site's ability to bind substrate effectively.

With abundant substrate, adding more enzyme provides more catalytic sites, increasing the overall rate.

Appropriate temperature and pH preserve the enzyme's three-dimensional structure necessary for catalysis.

High temperatures disrupt the weak bonds stabilizing enzyme structure, reducing catalytic activity.

When substrate is limiting, many enzyme molecules remain free, preventing the reaction from reaching its maximum rate.

Each enzyme has a characteristic optimum temperature and pH where its catalytic efficiency is greatest because its active site has the proper conformation and ionization state.

Thermophilic enzymes are structurally adapted to function efficiently at temperatures that would denature most ordinary enzymes.

The ionization state of amino acid residues determines substrate binding and catalytic efficiency. Changes in pH alter these charges.

More enzyme molecules provide more active sites, allowing more substrate molecules to be converted into product per unit time.

Temperature and pH strongly influence enzyme activity. Keeping them constant allows the effect of the experimental variable to be measured accurately.

As substrate becomes depleted, enzyme-substrate complex formation decreases, reducing the overall reaction rate.

Low temperature slows the movement of enzyme and substrate molecules, reducing effective collisions. The effect is generally reversible.