Question 1

Which of the following statements accurately describes amylopectin?

Accepted Answer

A) Amylopectin produces glucose at a slower rate than other starches. 
B) The amylopectin chain is not coiled. 
C) Amylopectin is composed of polymeric amylose sugars. 
D) The amylopectin chain is highly branched. 
E) All of the above are untrue. 
A) Amylopectin produces glucose at a slower rate than other starches. 
B) The amylopectin chain is not coiled. 
C) Amylopectin is composed of polymeric amylose sugars. 
D) The amylopectin chain is highly branched. 
E) All of the above are untrue. D

Question 2

Lipids are insoluble in water because ________.

Accepted Answer

A) they contain a large number of polar hydrocarbon units 
B) they are synthesized from carbohydrates 
C) they contain no polar functional groups 
D) water cannot compete with the strong attraction lipids have for themselves 
A) they contain a large number of polar hydrocarbon units 
B) they are synthesized from carbohydrates 
C) they contain no polar functional groups 
D) water cannot compete with the strong attraction lipids have for themselves C

Question 3

Which of the following statements best describe cells within biological systems?

Accepted Answer

A) Cells are chemical factories where biomolecules are created or used. 
B) Cells can only create chemicals; organelles are used to consume the chemicals. 
C) Cells have a nucleus where the bulk of the mass is stored. 
D) Cells are the fundamental unit of matter. 
E) All of the above are true. 
A) Cells are chemical factories where biomolecules are created or used. 
B) Cells can only create chemicals; organelles are used to consume the chemicals. 
C) Cells have a nucleus where the bulk of the mass is stored. 
D) Cells are the fundamental unit of matter. 
E) All of the above are true. A

Question 4

What is the main structural feature that distinguishes lipids from other biomolecules?

Accepted Answer

A) Lipids contain a large number of nonpolar, hydrophobic functional groups. 
B) Lipids form coiled structures with extensive amounts of branching. 
C) Lipids contain a large number of hydrogen bonding functional groups. 
D) Lipids form rigid, linear arrays of polymeric molecules that cannot be easily dissolved. 
E) none of the above 
A) Lipids contain a large number of nonpolar, hydrophobic functional groups. 
B) Lipids form coiled structures with extensive amounts of branching. 
C) Lipids contain a large number of hydrogen bonding functional groups. 
D) Lipids form rigid, linear arrays of polymeric molecules that cannot be easily dissolved. 
E) none of the above

Question 5

Why do changes in pH interfere with the function of proteins? For your answer, consider the acid/base character of many amino acid side chains.

Accepted Answer

A) At high pH the acidic side chains of amino acids such as glutamic acid and tyrosine will become negatively charged as they lose a hydrogen ion. 
B) At low pH the alkaline side chains of amino acids such as lysine and histidine will become positively charged as they gain a hydrogen ion. 
C) A change in pH can result in a change in the type of molecular attractions that occur among amino acids within a polypeptide. 
D) all of the above 
A) At high pH the acidic side chains of amino acids such as glutamic acid and tyrosine will become negatively charged as they lose a hydrogen ion. 
B) At low pH the alkaline side chains of amino acids such as lysine and histidine will become positively charged as they gain a hydrogen ion. 
C) A change in pH can result in a change in the type of molecular attractions that occur among amino acids within a polypeptide. 
D) all of the above

Question 6

The following statement describes what level of structure in a protein? The chain of amino acids coils into a helix.

Accepted Answer

A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
E) none of the above 
A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
E) none of the above

Question 7

When an unknown peptide containing five amino acids is treated with an enzyme that hydrolyzes only the serine-leucine peptide bond, the fragments Leu-Cys, Ser, Leu-Ser are formed. What was the original amino acid sequence in the peptide?

Accepted Answer

A) Cys-Ser-Leu-Ser-Leu 
B) Leu-Cys-Leu-Ser 
C) Leu-Ser-Leu-Cys 
D) Ser-Leu-Ser-Leu-Cys 
A) Cys-Ser-Leu-Ser-Leu 
B) Leu-Cys-Leu-Ser 
C) Leu-Ser-Leu-Cys 
D) Ser-Leu-Ser-Leu-Cys

Question 8

Every biomolecule discussed in Chapter 13 contains ________.

Accepted Answer

A) a nitrogen atom 
B) a sulfur atom 
C) an oxygen atom 
D) a phosphorus atom 
A) a nitrogen atom 
B) a sulfur atom 
C) an oxygen atom 
D) a phosphorus atom

Question 9

How do inhibitors work to prevent an enzyme from functioning?

Accepted Answer

A) Inhibitors block the receptor site. 
B) Inhibitors alter the receptor site. 
C) Inhibitors bind to an enzyme. 
D) all of the above 
E) none of the above 
A) Inhibitors block the receptor site. 
B) Inhibitors alter the receptor site. 
C) Inhibitors bind to an enzyme. 
D) all of the above 
E) none of the above

Question 10

Glycogen is most structurally similar to ________.

Accepted Answer

A) amylopectin 
B) cellulose 
C) amylose 
D) pectin 
E) chitin 
A) amylopectin 
B) cellulose 
C) amylose 
D) pectin 
E) chitin

Question 11

Which of the following statements accurately describes amylose?

Accepted Answer

A) Amylose releases glucose at a slower rate than other starches. 
B) The amylose chain is not coiled. 
C) Amylose is composed of polymeric amylose sugars. 
D) The amylose chain is highly branched. 
E) All of the above are untrue. 
A) Amylose releases glucose at a slower rate than other starches. 
B) The amylose chain is not coiled. 
C) Amylose is composed of polymeric amylose sugars. 
D) The amylose chain is highly branched. 
E) All of the above are untrue.

Question 12

What is the purpose of an enzyme?

Accepted Answer

A) to speed up biochemical reactions 
B) to slow down biological reactions 
C) to bind molecules and keep them out of the body 
D) to slice sucrose into two ore more pieces 
E) none of the above 
A) to speed up biochemical reactions 
B) to slow down biological reactions 
C) to bind molecules and keep them out of the body 
D) to slice sucrose into two ore more pieces 
E) none of the above

Question 13

The most abundant organic compound on Earth is ________.

Accepted Answer

A) silicon dioxide 
B) cellulose 
C) water 
D) DNA 
A) silicon dioxide 
B) cellulose 
C) water 
D) DNA

Question 14

What is the major difference between nucleotides of deoxyribonuleic acid and ribonucleic acid?

Accepted Answer

A) The deoxyribose nucleic acid is missing a hydroxyl group on the sugar. 
B) The deoxyribose nucleic acid is missing a hydroxyl group on the nitrogenous base. 
C) The ribose nucleic acid is missing a hydroxyl group on the sugar. 
D) The ribose nucleic acid is missing a hydroxyl group on the nitrogenous base. 
E) Only the nitrogenous bases are different. 
A) The deoxyribose nucleic acid is missing a hydroxyl group on the sugar. 
B) The deoxyribose nucleic acid is missing a hydroxyl group on the nitrogenous base. 
C) The ribose nucleic acid is missing a hydroxyl group on the sugar. 
D) The ribose nucleic acid is missing a hydroxyl group on the nitrogenous base. 
E) Only the nitrogenous bases are different.

Question 15

How does amylose differ from amylopectin?

Accepted Answer

A) Amylose is a starch in which the glucose units are liked in chains that coil but do not branch. 
B) Amylopectin is a starch in which the glucose units are liked in chains that both coil and branch. 
C) Both A and B are true. 
D) Amylopectin is a starch produced by plants. However, although amylose is a starch, it is not produced by plants. 
A) Amylose is a starch in which the glucose units are liked in chains that coil but do not branch. 
B) Amylopectin is a starch in which the glucose units are liked in chains that both coil and branch. 
C) Both A and B are true. 
D) Amylopectin is a starch produced by plants. However, although amylose is a starch, it is not produced by plants.

Question 16

What is the functional group that is formed during formation of a fat?

Accepted Answer

A) an ester 
B) an ether 
C) an alcohol 
D) an amide 
E) an amine 
A) an ester 
B) an ether 
C) an alcohol 
D) an amide 
E) an amine

Question 17

What is the role of soluble fiber in a well-balanced diet?

Accepted Answer

A) absorbs toxins and cholesterol 
B) to keep you regular 
C) to keep you irregular 
D) acts as an energy source 
E) none of the above 
A) absorbs toxins and cholesterol 
B) to keep you regular 
C) to keep you irregular 
D) acts as an energy source 
E) none of the above

Question 18

Fats and carbohydrates have similar chemical composition. Why?

Accepted Answer

A) Fats are biologically synthesized from carbohydrates. 
B) Fats and carbohydrates are both biomolecules. 
C) Fats and carbohydrates have the same functional groups. 
D) Fats and carbohydrates have similar chemical structures. 
E) all of the above 
A) Fats are biologically synthesized from carbohydrates. 
B) Fats and carbohydrates are both biomolecules. 
C) Fats and carbohydrates have the same functional groups. 
D) Fats and carbohydrates have similar chemical structures. 
E) all of the above

Question 19

Which will satisfy your hunger for a longer period of time?

Accepted Answer

A) spaghetti, glycemic index = 36 
B) popcorn, glycemic index = 55 
C) Snickers Bar, glycemic index = 64 
D) french fries, glycemic index = 75 
E) All of the above have the same effect on hunger. 
A) spaghetti, glycemic index = 36 
B) popcorn, glycemic index = 55 
C) Snickers Bar, glycemic index = 64 
D) french fries, glycemic index = 75 
E) All of the above have the same effect on hunger.

Question 20

The main role of DNA is to provide instructions on how to build ________.

Accepted Answer

A) proteins 
B) carbohydrates 
C) lipids 
D) all of the above 
A) proteins 
B) carbohydrates 
C) lipids 
D) all of the above

Which of the following statements accurately describes amylopectin?

Lipids are insoluble in water because ________.

Which of the following statements best describe cells within biological systems?

What is the main structural feature that distinguishes lipids from other biomolecules?

Why do changes in pH interfere with the function of proteins? For your answer, consider the acid/base character of many amino acid side chains.

The following statement describes what level of structure in a protein? The chain of amino acids coils into a helix.

When an unknown peptide containing five amino acids is treated with an enzyme that hydrolyzes only the serine-leucine peptide bond, the fragments Leu-Cys, Ser, Leu-Ser are formed. What was the original amino acid sequence in the peptide?

Every biomolecule discussed in Chapter 13 contains ________.

How do inhibitors work to prevent an enzyme from functioning?

Glycogen is most structurally similar to ________.

Which of the following statements accurately describes amylose?

What is the purpose of an enzyme?

The most abundant organic compound on Earth is ________.

What is the major difference between nucleotides of deoxyribonuleic acid and ribonucleic acid?

How does amylose differ from amylopectin?

What is the functional group that is formed during formation of a fat?

What is the role of soluble fiber in a well-balanced diet?

Fats and carbohydrates have similar chemical composition. Why?

Which will satisfy your hunger for a longer period of time?

The main role of DNA is to provide instructions on how to build ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

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Exam 13: Nutrients of Life

Which of the following statements accurately describes amylopectin?

Lipids are insoluble in water because ________.

Which of the following statements best describe cells within biological systems?

What is the main structural feature that distinguishes lipids from other biomolecules?

Why do changes in pH interfere with the function of proteins? For your answer, consider the acid/base character of many amino acid side chains.

The following statement describes what level of structure in a protein? The chain of amino acids coils into a helix.

When an unknown peptide containing five amino acids is treated with an enzyme that hydrolyzes only the serine-leucine peptide bond, the fragments Leu-Cys, Ser, Leu-Ser are formed. What was the original amino acid sequence in the peptide?

Every biomolecule discussed in Chapter 13 contains ________.

How do inhibitors work to prevent an enzyme from functioning?

Glycogen is most structurally similar to ________.

Which of the following statements accurately describes amylose?

What is the purpose of an enzyme?

The most abundant organic compound on Earth is ________.

What is the major difference between nucleotides of deoxyribonuleic acid and ribonucleic acid?

How does amylose differ from amylopectin?

What is the functional group that is formed during formation of a fat?

What is the role of soluble fiber in a well-balanced diet?

Fats and carbohydrates have similar chemical composition. Why?

Which will satisfy your hunger for a longer period of time?

The main role of DNA is to provide instructions on how to build ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters