Unit 3 review

The name of the region of the enzyme that catalyzes chemical reactions.

• active site

• substrate

• reactant

• products

What is the general trend for enzymes and cold temperatures?

• Reactions are slower at colder temperatures.

• reactions speed up at colder temperatures

• cold temperature does not affect enzyme reactions

What happens to enzyme reactions when temperatures warm up?

• reactions speed up

• reactions slow down

• reactions stay the same

Tags

NGSS.HS-PS1-5

What is the primary function of an enzyme in biological reactions?

• To provide the reactants

• To increase the reaction rate

• To act as a product

• To decrease the reaction rate

Letter C in the picture is...

• active site
• enzyme
• substrate
• products

In cases of extremely high temperatures or extreme ranges of pH, what happens to the shape/conformation of enzymes and its active site?

• the shape/conformation changes permanently, making the enzyme not work

• the shape/conformation stays the same, not affecting the enzyme reaction

• the shape/conformation slightly changes and can go back

• the change in shape/conformation makes the enzyme work better

What is being shown in the picture?

• when enzymes denature, they can no longer bind substrates to its active site

• when enzymes denature they work better than before

• changing the shape of the enzyme does not affect its effectiveness

• The enzymes changes shape once the substrate has been reacted

1. Which statement applies to enzymes?

• Enzyme function depends on collisions between substrate and active sites.

• One active site typically binds to a broad range of substrates.

• The active site on the substrate is specific to one enzyme.

• When enzymes are immobilized they stop working.

When looking at a graph of enzyme activity versus substrate concentration, what is the reason for the curve leveling off?

• All the enzyme active sites are occupied by substrates.

• There is insufficient substrate for the enzyme to act on.

• The enzymes have all been consumed in the reaction.

• The product acts as an enzyme inhibitor.

What happens to enzyme activity as you move away from the optimal pH?

• a diminished rate of reaction

• an improved rate of reaction

• reaction stays the same

• reaction is not affected