Question 1

Which of the following best describes the role of an enzyme in a biological reaction?

Accepted Answer

An enzyme lowers the activation energy of a reaction, increasing the reaction rate without being consumed.

Question 2

In the laboratory experiment, what was the name of the enzyme used and its specific substrate?

Accepted Answer

Amylase and starch

Question 3

When the substrate was metabolized by the enzyme in the experiment, which products were formed, and which could be immediately used to create energy?

Accepted Answer

Glucose and maltose; glucose can be immediately used for energy

Question 4

You are tasked with designing an experiment to maximize the amount of product formed by the enzyme from the lab. Which set of conditions would you choose and why?

Accepted Answer

Optimal temperature and pH for the enzyme, with high substrate concentration, to ensure maximum enzyme activity and product formation.

Question 5

Suppose a graph shows enzyme activity at various temperatures. At which temperature would you expect the highest enzymatic activity, and why?

Accepted Answer

At the enzyme's optimal temperature, because the enzyme's structure is most suited for catalysis at this point.

Question 6

Why is there little to no enzymatic activity observed at both 0°C and 100°C, as seen in the experiment's results?

Accepted Answer

At 0°C, molecular motion is too slow for effective collisions; at 100°C, the enzyme is denatured and loses its function.

Question 7

In an experiment, a substrate analog was added that closely resembled the original substrate. What was the purpose of this experiment?

Accepted Answer

To test for competitive inhibition, where the analog competes with the substrate for the enzyme's active site.

Question 8

EDTA was added to the enzyme reaction, resulting in a decrease in product from 1000 mg/ml (control) to 250 mg/ml. What does this suggest about the enzyme's activity?

Accepted Answer

EDTA chelates essential metal ions, reducing enzyme activity by removing necessary cofactors.

Question 9

Which of the following equations best represents the effect of an enzyme on the activation energy ($$E_a) of a $$reaction?

Accepted Answer

$$E_{a,\ enzyme} \u003c E_{a,\ uncatalyzed}$$

Question 10

A patient is diagnosed with a genetic disorder that results in a nonfunctional amylase enzyme. Which of the following would most likely be observed in this patient after consuming a starch-rich meal?

Accepted Answer

Elevated levels of undigested starch in the digestive tract and reduced glucose absorption.

Question 11

If you increase the substrate concentration in an enzyme-catalyzed reaction, what will happen to the reaction rate, assuming the enzyme is not saturated?

Accepted Answer

The reaction rate will increase until the enzyme becomes saturated.

Question 12

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The enzyme's active site has a unique three-dimensional shape that fits only specific substrates.

Question 13

A competitive inhibitor is added to an enzyme-catalyzed reaction. Which of the following is most likely to occur?

Accepted Answer

The inhibitor binds to the active site, preventing the substrate from binding and decreasing the reaction rate.

Question 14

Which of the following best describes the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity increases with temperature up to an optimal point, then decreases as the enzyme denatures.

Question 15

In a reaction where amylase breaks down starch into glucose, which of the following equations best represents the overall reaction?

Accepted Answer

$$	ext{Starch} + 	ext{H}_2	ext{O} \xrightarrow{	ext{amylase}} 	ext{Glucose}$$

Question 16

A student adds EDTA to an enzyme reaction and observes a significant decrease in product formation. What is the most likely explanation for this observation?

Accepted Answer

EDTA removes essential metal ions required for enzyme activity, acting as a chelating agent.

Question 17

Which of the following scenarios would most likely result in the highest rate of product formation in an enzyme-catalyzed reaction?

Accepted Answer

Optimal temperature and pH, with sufficient substrate and cofactors present.

Question 18

If a substrate analog is used in an experiment and the reaction rate decreases, what does this indicate about the analog's interaction with the enzyme?

Accepted Answer

The analog is acting as a competitive inhibitor, occupying the active site and preventing substrate binding.

Question 19

Which of the following best explains why the addition of EDTA to an enzyme reaction can decrease the amount of product formed?

Accepted Answer

EDTA binds to metal ions required by the enzyme, inhibiting its catalytic activity.

General Biology: Enzyme Lab Study Guide

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