Enzymes and digestion

Last updated 3 months ago

31 questions

2

1

3

1

10

4

1

describe biological and chemical processes that maintain homeostasis;

1

describe biological and chemical processes that maintain homeostasis;

1

Under which conditions is enzyme A most productive?

at 50' C and a pH of 9

at 40'C and a pH of 5

at 45' C and a pH of 5

at 45' C and a pH of 9

Various enzymes in our bodies are:

Lipids

Carbohydrates

Nucleotides

Proteins

Enzymes only work with specific substrates because each enzyme:

Has an active site which only fits substrates with a particular shape.

Can only make ionic bonds.

Cannot change shape.

Becomes denatured when it is heated.

Structural changes in an enzyme can affect its ability to function correctly. This denaturation can occur as a result of _______________.

Extreme temperature change

Change in pH

Addition of substrates

Both A and B are correct

What is the optimal temperature for this enzyme?

20℃

32℃

45℃

60℃

Label the parts of this diagram showing the catalyzed reaction breaking down hydrogen peroxide into water and oxygen using the terms (A) enzyme, (B) substrate, and (C) products.

In the lock and key model of of enzyme function shown above, what is happening in step 2?

The enzyme is causing new bonds to form between the substrate

The substrates are beginning to bind to the enzyme

The active sites are restructuring the enzyme.

The catalyzed reaction is releasing a product.

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.

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.

You are analyzing a compound in the laboratory. You find that it is made up of carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon atom. How will you classify the compound?

Lipid

Carbohydrate

Nucleic Acid

Protein

Fats, oils and cholesterol are all types of what?

Lipids

Nucleic Acid

Carbohydrates

Proteins

The enzyme lactase will break down the sugar lactose into which of the following components? (hint: look at the -ose ending of lactose)

Lipids

Nucleic Acids

Carbohydrates

Proteins

Which sequence shows the pathway that food takes in the digestive system?

stomach, esophagus, large intestine, small intestine

esophagus, stomach, large intestine, small intestine

stomach, esophagus, small intestine, large intestine

esophagus, stomach, small intestine, large intestine

Which of the following system breaks food into nutrients that can be used by the body?

circulatory

digestive

respiratory

reproductive

The digestion process begins in which of the following?

large intestine

mouth

small intestine

stomach

Which best describes the role of the esophagus in digestion?

It releases acid and mixes the food.

It aids in absorption of nutrients from food.

It carried food from the mouth to the stomach.

It carries food from the stomach to the intestines.

What does the stomach do for the body?

It chews food.

It breaks food down.

It swallows food.

None of the above

What is the primary function of the large intestine?

to digest proteins

to absorb nutrients

to beak down complex carbohydrates

to remove water from undigested waste

Look at the diagram above and answer the question below.

1 and 2

2 and 3

3 and 4

1 and 4

The digestive deconstructs food both mechanically and chemicaly.

True

False

The alimentary canal can also be referred to as the .......

The process of digestion starts where?

the small intestines 

the large intestines 

the mouth, by chewing food. 

This is the

substrate

enzyme

active site

This is the

substrate

enzyme

active site

This is the

substrate

enzyme

active site

D

A

B

C

D

At what temperature does this enzyme work the fastest?

0

20

40

60

A

B

C

D

Which enzyme works best in an acidic environment (pH less than 7)

Which enzyme works best in a neutral environment?

chymrotrypsin

pepsin

both enzymes

What happens to the enzyme when the pH increases to high?

Under which conditions is enzyme A most productive?

at 50' C and a pH of 9

at 40'C and a pH of 5

at 45' C and a pH of 5

at 45' C and a pH of 9

Various enzymes in our bodies are:

Lipids

Carbohydrates

Nucleotides

Proteins

Enzymes only work with specific substrates because each enzyme:

Has an active site which only fits substrates with a particular shape.

Can only make ionic bonds.

Cannot change shape.

Becomes denatured when it is heated.

Structural changes in an enzyme can affect its ability to function correctly. This denaturation can occur as a result of _______________.

Extreme temperature change

Change in pH

Addition of substrates

Both A and B are correct

What is the optimal temperature for this enzyme?

20℃

32℃

45℃

60℃

In the lock and key model of of enzyme function shown above, what is happening in step 2?

The enzyme is causing new bonds to form between the substrate

The substrates are beginning to bind to the enzyme

The active sites are restructuring the enzyme.

The catalyzed reaction is releasing a product.

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.

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.

You are analyzing a compound in the laboratory. You find that it is made up of
carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon
atom. How will you classify the compound?

Lipid

Carbohydrate

Nucleic Acid

Protein

Fats, oils and cholesterol are all types of what?

Lipids

Nucleic Acid

Carbohydrates

Proteins

The enzyme lactase will break down the sugar lactose into which of the following
components? (hint: look at the -ose ending of lactose)

Lipids

Nucleic Acids

Carbohydrates

Proteins

Which sequence shows the pathway that food takes in the digestive system?

stomach, esophagus, large intestine, small intestine

esophagus, stomach, large intestine, small intestine

stomach, esophagus, small intestine, large intestine

esophagus, stomach, small intestine, large intestine

Which of the following system breaks food into nutrients that can be used by the body?

circulatory

digestive

respiratory

reproductive

The digestion process begins in which of the following?

large intestine

mouth

small intestine

stomach

Which best describes the role of the esophagus in digestion?

It releases acid and mixes the food.

It aids in absorption of nutrients from food.

It carried food from the mouth to the stomach.

It carries food from the stomach to the intestines.

What does the stomach do for the body?

It chews food.

It breaks food down.

It swallows food.

None of the above

What is the primary function of the large intestine?

to digest proteins

to absorb nutrients

to beak down complex carbohydrates

to remove water from undigested waste

Look at the diagram above and answer the question below.

1 and 2

2 and 3

3 and 4

1 and 4

The digestive deconstructs food both mechanically and chemicaly. 

True

False

The process of digestion starts where? 

the small intestines 

the large intestines 

the mouth, by chewing food. 

This is the

substrate

enzyme

active site

This is the 

substrate

enzyme

active site

This is the

substrate

enzyme

active site

D

A

B

C

D

At what temperature does this enzyme work the fastest?

0

20

40

60

A

B

C

D

Which enzyme works best in a neutral environment?

chymrotrypsin

pepsin

both enzymes