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EOC - Enzymes

Last updated almost 5 years ago

5 questions

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Question 1

1.

The equation below represents a simplified chemical reaction that occurs in humans.

That data should be collected to support the hypothesis that enzyme C works best in an environment that is around 40 degrees celsius?

The amino acid sequence of enzyme C

The amount of substance W produced in five minutes at various temperatures

The shape of the substances X and Y after the reaction occurs

The amount of substance W produced in five minutes at various pH levels

Question 2

2.

In a class, each student made three models of the small intestine using three artificial membrane tubes. They filled each of the three tubes with equal amounts of water, starch, protein and vitamin C. The added starch-digesting enzyme to tube 1. They added protein-digesting enzyme to tube 2. No enzyme was added to tube 3. The ends of the membrane tubes were sealed and the tubes were soaked for 24 hours in beakers of pure water. The beakers were numbered 1, 2, and 3, corresponding to the matter of the tube they contained. At the end of the experiment, the students removed the tubes and tested the water in the beakers for the presence of nutrients.

Reminder: Starch is a LARGE carbohydrate. Only very small molecules will fit through the membrane tubes (travel from the tube into the beaker).

Based on the experiment above, sugar would most likely be present in:

Beaker 1 

Beaker 2

Beaker 1 and 3

Beaker 1, 2 and 3. 

Question 3

3.

Some bacteria live in hot springs. Their cells contain enzymes that function best at temperatures of 70 °C or higher. At the temperature of 50 °C, how will the enzymes in these bacterial cells most likely be affected?

The enzymes will be destroyed by lysosomes.

The enzymes will lose their bond structure and fall apart.

The enzymes will require less energy to function than at 70 °C.

The enzymes will not increase the rate of reactions as much as they would at 70 °C.

Question 4

4.

Many of the proteins in the human body are enzymes that catalyze chemical reactions. What is the relationship between enzymes and activation energy?

When an enzyme catalyzes a reaction, it increases the activation energy of the reaction

When an enzyme catalyzes a reaction, it increases the activation energy of the product.

When an enzyme catalyzes a reaction, it decreases the activation energy of the reaction.

When an enzyme catalyzes a reaction, it does not affect the activation energy of the reaction.

Question 5

5.

As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloric acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?

It begins to replicate

It becomes inactive

Its shape changes to engulf large proteins

Its activity increases to digest more proteins.