AP Unit 3 Review (Energy & Enzymes)

A chemical reaction which releases energy for the cell to use through the degradation of chemical bonds.

• Anabolic

• Endergonic

• Catabolic

• Photosynthesis

Tags

NGSS.HS-LS1-7

A chemical reaction which stores potential energy through the construction of chemical bonds.

• Anabolic

• Exergonic

• Catabolic

• Digestion

Tags

NGSS.HS-PS1-4

To which category of ORGANIC molecules do most enzymes belong?

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

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NGSS.HS-LS1-1

NGSS.HS-LS1-6

All of the following are TRUE of enzymes except which?

• Enzymes are molecular CATALYSTS

• Enzymes REDUCE activation energy

• Enzymes are CONSUMED by the reaction

• Enzymes operate under OPTIMAL conditions

A chemical reaction in which the products have MORE chemical potential energy than the reactants is called...

• Endergonic

• Exergonic

• Metabolic

• Catabolic

Answer explanation

Endergonic reactions STORE energy through the construction of chemical bonds.

Tags

NGSS.HS-PS1-4

A chemical reaction in which the products have LESS chemical potential energy than the reactants...

• Endergonic

• Exergonic

• Anabolic

• Metablic

Tags

NGSS.HS-PS1-4

Which of the following would be LEAST disruptive to enzyme-substrate binding?

• A decrease in temperature

• A non-competitive inhibitor

• A significant change in pH

• An increase in temperature

Answer explanation

A decrease in temperature does not change the shape of the enzyme, the other factors do.

Kinases are a special category of enzymes that do what?

• Add phosphate groups and turn molecules ON

• Add phosphate groups and turn molecules OFF

• Remove phosphate groups and turn molecules ON

• Remove phosphate groups and turn molecules OFF

How do enzymes influence activation energy?

• Enzymes increase activation energy; reactants reach transition state later

• Enzymes increase activation energy; reactants reach transition state sooner

• Enzymes decrease activation energy; reactants reach transition state later

• Enzymes decrease activation energy; reactants reach transition state sooner

Tags

NGSS.HS-PS1-4

In which of the following ways does pH interfere with enzyme activity?

• a change in pH disrupts H-bonds; the enzyme denatures

• a change in pH promotes enzyme-substrate binding so the reaction happens faster

• a change in pH increases the chance of a competitive inhibitor binding with the enzyme

• a change in pH is a form of allosteric regulation and turns enzymes on or off