Unit 2- Mod Retest

Which of these will most likely happen if an enzyme is added to a certain chemical reaction? Select TWO correct answers.

• The rate of reaction will decrease.

• The reaction will completely stop.

• The activation energy will be lowered.

• The rate of reaction will start to increase.

Tags

NGSS.HS-PS1-5

One way the enzyme and substrate interact using the model is that the enzyme binds to the substrate at a specific site.

• The enzyme binds to the substrate at a specific site.

• The enzyme changes the substrate into an enzyme.

• The substrate breaks down the enzyme completely.

• The enzyme and substrate do not interact at all.

The significance of the shape of the enzyme is that it:

• determines the enzyme's specificity and function

• allows the enzyme to be used for energy storage

• makes the enzyme resistant to temperature changes

• prevents the enzyme from binding to substrates

According to the graph, what is the best temperature range for the enzyme activity?

• 20°-30°

• 10°-20°

• 30°-40°

A student measured the time required for a carbohydrate sample to be completely digested in the presence of an enzyme under different pH levels. At which pH does the enzyme have the fastest reaction time?

• 6.8

• 6.9

• 7.1

Tags

NGSS.HS-PS1-5

Complete the statement below using the correct terms: activation energy, reaction, substrate, enzyme. A chemical reaction can be sped up when our bodies use a substance called a(n) _______. These help lower the _______ needed to start the _______.

• enzyme, activation energy, reaction

• substrate, reaction, enzyme

• activation energy, substrate, enzyme

• reaction, enzyme, substrate

Environmental conditions can change the shape of the protein. What is the most likely result if the shape of the enzyme changes?

• The substrate will change its shape to match the enzyme

• The enzyme will no longer be able to catalyze the reaction with the substrate

• The products made from the enzyme and the substrate will be changed

If enzyme 2 is denatured, the levels of which substance will increase?

• Lactose

• Galactose

• Glucose 1 phosphate

Rennin is an enzyme that catalyzes a reaction that turns liquid milk into a solid. Rennin was added to three different test tubes with milk. Each test tube was placed in a water bath for ten minutes. The data collected during the experiment are shown. Test Tube | Variable | Result 1 | Cold water bath | Few solids present in the liquid milk 2 | Room-temperature water bath | Semi-solid milk 3 | Hot water bath | No solids, only liquid milk Which statement best explains the result of test tube 3?

• A. The enzyme changed the product.

• B. The substrate was used up.

• C. The enzyme was denatured.

Which of the following best explains how enzymes regulate metabolic pathways?

• A. Enzymes increase the temperature of the cell to speed up reactions.

• B. Enzymes lower the activation energy of specific reactions, allowing the pathway to proceed more efficiently and the reaction occur more quickly.

• C. Enzymes act as a source of energy for the pathway to continue.