Honors Quiz #2: Structure and Function of Enzymes

The graph shows the effect of temperature on the relative rate of enzyme activity. What is happening to the enzyme at 60º C?

The table below shows the effect of enzyme X on a substrate over time. The data in the table reveal that the role of the enzyme is to facilitate a reaction.

The data further reveal that...

• once the supply of the substrate is exhausted, the enzyme cannot cause another reaction to occur.

• once the supply of the substrate is renewed, the enzyme can cause the reaction to occur exactly as it did before.

• once the supply of the substrate is exhausted, the enzyme transforms the product into the substrate.

• once the supply of the substrate is renewed, the enzyme prevents the substrate from transforming into products.

Meat tenderizer contains an enzyme that breaks down meat. If meat is coated with tenderizer and then placed in a refrigerator, how would the enzyme be affected?

• It would change shape.

• It would break down the meat more slowly.

• It would break down the meat more quickly.

• It would disintegrate.

Mr. Johnson is giving a lesson on enzymes in his freshman biology class. Mr. Johnson displays six beakers with either a chemical substrate or chemical enzyme in them. He tells the class that each of the substrates will spontaneously degrade over a set period of time. He asks the class to identify what would happen if he were able to apply the correct enzyme to the correct substrate.

How would Mr. Johnson's class know if the correct enzyme and substrate were applied?

Which of the following is a true statement about enzymes?

• Enzymes are fats.

• All enzymes slow down chemical reactions.

• Enzymes only work on one specific chemical reaction.

• Enzymes are produced by the brain.

The table below shows the rate at which yeast metabolizes various carbohydrates based on the number of carbon dioxide bubbles produced per minute.

After five minutes, which type of carbohydrate does yeast metabolize at the greatest rate?

• galactose

• fructose

• maltose

• sucrose

Tags

NGSS.HS-LS2-3

The diagram below represents the energy levels required for molecules A and B to combine and form AB. What would the addition of an enzyme, specific for the reaction between A and B, do to the activation energy?

• It would increase the activation energy.

• It will keep the activation energy constant.

• It will inhibit the activation energy.

• It would decrease the activation energy.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

When corn is picked at the right time, it tastes sweet due to its high sugar content. Soon after being picked, the corn plant uses enzymes to convert the sugars to starch. Doing this allows the plant to store energy better as sugar is water soluble, but starch is not. After a single day, corn can convert half of its sugars into starch. The sweetness in corn can be preserved by boiling freshly picked corn and then cooling it.

Why would boiling preserve the sweetness in the freshly picked corn?

Tags

NGSS.HS-PS1-5

A substrate is a substance that is affected by an enzyme. In order for an enzyme to be effective, it must...

• bind to a substrate, transform itself into more of the substrate, and release higher amounts of the substrate as a product.

• bind to a substrate, transform itself and the substrate into products, and cause these products to dissolve.

• bind to a substrate, transform itself into products, and release these products.

• bind to a substrate, transform the substrate into products, and release the products.

An enzyme and four different molecules are shown in the diagram. Which molecules would this enzyme most likely affect in a reaction?

• molecule C, only

• molecule A, only

• molecules A and C

• molecules B and D