An enzyme speeds up a reaction by

lowering the activation energy.

At high temperatures enzyme activity declines because of:

Dissociation of Ionic Compounds

At low temperatures enzyme activity declines because of:

Dissociation of Ionic Compounds

Which of the following conclusions can be drawn from this graph?

The optimum pH of the enzyme is 6.6.

The optimum pH of the enzyme is 5.8

The enzyme’s activity increases as pH increases 5.0 to 9.0

The enzyme’s activity is greater around pH of 8.0 .

Trypsin is an enzyme that is secreted into the small intestine to further break down peptides into their amino acids. If trypsin is mixed in with a solution of starch molecules, which of the following is most likely to happen?

Trypsin will not break down the starch because enzymes are substrate specific.

Trypsin will break down the starch if the pH is within the optimum range.

Trypsin will break down the starch if the temperature is within the optimum range.

Trypsin will not breakdown the starch if the solution is not in the small intestine.

What will most likely happen if an appropriate enzyme is added to a chemical reaction?

The reaction rate will increase.

The reaction rate will decrease

The equilibrium of the reaction will be maintained.

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

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.

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's shape changes to engulf large proteins.

It's activity increases to digest more proteins

Enzymes - SUMMER

Quiz

•

Science, Biology

•

9th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-LS1-7, HS-PS1-5, MS-PS1-2

+5

Standards-aligned

BaYan N

Used 238+ times

FREE Resource

30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Enzymes are an example of

Lipids

Carbohydrate

Protein

Nucleic Acid

Tags

NGSS.MS-LS3-1

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the purpose of an enzyme?

give permission for the reaction

raise activation energy

speed up reactions

control how many reactions occur

Tags

NGSS.MS-LS1-7

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Each enzyme only has 1 substrate that will fit its active site. What is this called?

reusable

catalyst

specific

fragile

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What 3 letters do enzymes typically end in?

-ose

-ase

-ese

-tic

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Any substance that is acted upon by an enzyme is called a(n)?

Coenzyme

Substrate

Vitamin

Polypeptide

Tags

NGSS.MS-LS1-7

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

a substrate

an enzyme

a product

an active site

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In the diagram, what is letter A?

product

substrate

enzyme-substrate complex

active site

Tags

NGSS.MS-LS1-7

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Enzymes - SUMMER

30 questions

Enzymes are an example of

What is the purpose of an enzyme?

Each enzyme only has 1 substrate that will fit its active site. What is this called?

What 3 letters do enzymes typically end in?

Any substance that is acted upon by an enzyme is called a(n)?

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

In the diagram, what is letter A?

Letter D...

Letter B...

Letter C...

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