AS BIO ENZYMES

The area that the substrate fits into on the enzyme is called the:

• Active Site
• Allosteric Site
• DiSulphide Bridge
• β-Pleated Sheet

Enzymes catalyze reactions by ___________ Activation Energy.

• Increasing
• Decreasing

At high temperatures enzyme activity declines because of:

• Denaturation
• Decreased Kinetic Motion
• Increased H-Bonding
• Dissociation of Ionic Compounds

At low temperatures enzyme activity declines because of:

• Denaturation
• Decreased Kinetic Motion
• Increased H-Bonding
• Dissociation of Ionic Compounds

Most enzymes have the ending:

• -ase
• -ose
• -ic acid
• -ate

The molecule an enzyme is working on is called the:

• Substrate
• Solvent
• Allosteric Inhibitor
• CoEnzyme

When a molecule can occupy the same active site as the substrate, a situation called __________________ can result

• Competitive lnhibition
• Allosteric Regulation
• Non-Competitive Inhibition
• Feedback Inhibition

Which explanation best fits the graph for pH's effect on an enzyme?

• As the pH gets closer to neutral more H-Bonds are broken
• Larger numbers of H+ & OH- ions distort the active site
• There are more collisions between substrates and active sites near the optimal pH
• Low pHs cause more H-Bonds to happen near the active site

Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. What is malonic acid's role with respect to succinate dehydrogenase?

• It is a competitive inhibitor.
• It is an allosteric regulator.
• It is able to bind to succinate.
• It blocks the binding of fumarate.

What is the optimal pH for this enzyme?

• 6

• 10

• 9

• 7