Enzymes STAAR

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.

• Enzymes decrease the energy level of the products.

• Enzyme decrease the activation energy of the reaction.

• Enzymes reverse the direction of the reaction.

An enzyme speeds up a reaction by

• lowering the activation energy.

• raising the activation energy.

• releasing energy.

• absorbing energy.

Tags

NGSS.HS-PS1-4

Which of these is NOT true?

• Enzymes can denature (change shape) when the temperature gets too high.

• Enzymes can only be used once in a chemical reaction. 

• Extreme pH can denature enzymes.

• Enzymes speed up chemical reactions. 

Line B in the given graph represents the reaction with an enzyme added to substrates. How did the enzyme affect the reaction?

• Increased the activation energy

• Increase the energy change

• Lowered the energy change

• Lowered the activation energy

Tags

NGSS.HS-PS1-5

At high temperatures enzyme activity declines because of:

• Denaturation

• Decreased Kinetic Motion

• Increased H-Bonding

• Dissociation of Ionic Compounds

Which biomolecule is also known as enzymes?

• Carbohydrate

• Lipid

• Nucleic Acid

• Protein

Which of these is NOT true about enzymes?

• Enzymes can denature (change shape) when the temperature gets too high.

• Enzymes can only be used once in a chemical reaction.

• Extreme pH can denature enzymes.

• Enzymes speed up chemical reactions.

Which biomolecule is also known as enzymes?

• Carbohydrate

• Lipid

• Nucleic Acid

• Protein

What is the role of enzymes in a chemical reaction?

• They slow down the reaction.

• They act as a reactant.

• They speed up the reaction.

• They are consumed in the reaction.

How does temperature affect enzyme activity?

• Enzyme activity increases indefinitely with temperature.

• Enzyme activity decreases with increasing temperature.

• Enzyme activity is not affected by temperature.

• Enzyme activity increases with temperature up to a point, then decreases.