Ap Biology Enzymes

What is the primary reason that a competitive inhibitor decreases enzyme activity?

• It causes denaturation of the enzyme

• It occupies the enzyme's active site

• It alters the enzyme's tertiary structure

• It blocks coenzyme binding

Which of the following conditions would most likely result in a nonfunctional enzyme?

• Minor mutation outside the active site

• Substrate with lower-than-expected concentration

• Mutation altering the charge of an amino acid within the active site

• Presence of a competitive inhibitor

• A reversible inhibitor binding outside the active site

Which of the following is not true about an allosteric enzyme?

• Allosteric enzymes undergo conformational changes upon effector binding

• Allosteric enzymes can be both activated and inhibited by different molecules

• Allosteric enzymes often show sigmoidal kinetics

• Allosteric enzymes have regulatory sites distinct from their active sites

• Allosteric enzymes bind inhibitors only at the active site

What kind of inhibition occurs when a molecule binds to a site other than the active site, reducing enzyme activity?

• Competitive inhibition

• Uncompetitive inhibition

• Non-competitive inhibition

• Allosteric activation

Which of the following is most likely to alter the tertiary structure of an enzyme?

• Increase in substrate concentration

• Decrease in temperature

• Change in pH

• Increase in product concentration

• Competitive inhibition

Which of the following enzyme properties is true for all enzymes?

• They decrease the activation energy of reactions

• They always require cofactors to function

• They are consumed in the reaction they catalyze

• They catalyze both endergonic and exergonic reactions

Which of the following is a key characteristic of enzymes?

• • they are consumed in the reactions they catalyze

• They only function at pH 7

• They are highly specific for their substrates

• They work equally well on all substrates

What is the active site of an enzyme?

What is the optimal temperature for most human enzymes?

What is the role of a coenzyme?

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NGSS.HS-LS1-7