Question 1

What is the function of a peptide bond?

Accepted Answer

A)   joins a sodium atom to a chloride atom
B)   helps hold one water molecule to an adjacent one
C)   links oxygen to hydrogen atoms
D)   joins an amino acid to an adjacent amino acid
E)   joins nucleotide bases to one another A peptide bond is a type of covalent bond that joins two amino acids together. This occurs by a dehydration reaction between the carboxyl group of one and the amino group of another.F) B) and D)
G) A) and D)

Question 2

How are lipids different from other categories of biological molecules?

Accepted Answer

A)   They are not seen in all living things.
B)   They do not have carbon.
C)   They are much more complex.
D)   They will not combine with water.
E)   They are not organic. Lipids are very diverse and have varied structures. None of the lipid types consist of repeated subunits as the other biological molecules. Lipids are hydrophobic molecules that do not readily mix with water.F) A) and C)
G) B) and D)

Question 3

The following figure represents which process?

Accepted Answer

A)   dehydration synthesis
B)   denaturation
C)   polyunsaturation
D)   hydrolysis
E)   combustionF) B) and C)
G) None of the above

Question 4

Select the incorrect association.

Accepted Answer

A)   glucose - monosaccharide
B)   cellulose - building block for cell walls in plants
C)   sucrose - table sugar
D)   fructose - a polysaccharide
E)   starch - a long chain of glucose Fructose is a monosaccharide. Polysaccharides include materials such as cellulose, starch, and glycogen.F) All of the above
G) A) and C) D

Question 5

What makes saturated triglycerides considerably less healthy than unsaturated ones?

Accepted Answer

A)   They taste better than other fats.
B)   They possess no double bonds between carbon atoms, which makes them more tightly packed together.
C)   Individuals tend to consume more saturated fats than unsaturated fats.
D)   Unsaturated fats are found in processed foods more frequently.
E)   They are digested more quickly by the body. Saturated fats have no double bonds between the carbon atoms. This arrangement makes saturated fat molecules pack together more tightly and, consequently, more difficult to digest. If the fat molecule is not digested adequately, there is the danger of these lipids accumulating in blood vessels in the form of plaque. It is a leading cause of the cardiovascular disease known as atherosclerosis.F) B) and E)
G) A) and C)

Question 6

Which word does not belong with the others?

Accepted Answer

A)   muscle
B)   antibodies
C)   sucrose
D)   enzymes
E)   hair Sucrose is a type of disaccharide carbohydrate. Muscle, antibodies, hair, and enzymes are all substances made of protein.F) A) and C)
G) A) and B)

Question 7

Which of the following is not an organic molecule?

Accepted Answer

A)   CaCO3
B)   C?6H12O6
C)   C256H381N65O79S6
D)   C18H34O2
E)   CH4F) A) and B)
G) A) and D) A

Question 8

Hydrolysis of sucrose, a disaccharide, results in

Accepted Answer

A)   two monomers.
B)   the release of functional groups.
C)   three monosaccharides.
D)   two glycerol units.
E)   two nucleotides. Sucrose is a disaccharide that when broken down by hydrolysis reactions results in two monosaccharide units.F) A) and E)
G) C) and D)

Question 9

A gene in DNA is the code for assembling a sequence of

Accepted Answer

A)   amino acids.
B)   glucose molecules.
C)   fatty acids used in a fat.
D)   sugars.
E)   functional groups. A gene is a series of nucleotides that codes for a specific sequence of amino acids to be assembled into a polypeptide.F) B) and E)
G) None of the above

Question 10

The principle role for sugars in living things is to

Accepted Answer

A)   form cell membranes.
B)   serve as a form of long-term energy storage.
C)   create our genetic code.
D)   create cellular energy.
E)   produce hormones. Carbohydrate sugars are used as an immediate energy source in living things.F) A) and D)
G) A) and C)

Question 11

What functional group makes a carbohydrate polar?

Accepted Answer

A)   -OH
B)   -NH2
C)   -SH
D)   -R
E)   -C-H The -OH is a polar functional group because it is soluble in water hydrophilic) .F) A) and E)
G) None of the above

Question 12

The primary structure of a protein refers to the

Accepted Answer

A)   interactions among two or more polypeptides.
B)   alpha helix or pleated sheets.
C)   side groups of the amino acids.
D)   number and sequence of amino acids.
E)   DNA nucleotide sequence that coded for it. The primary structure is comprised of the sequence of amino acids that have been joined together through peptide bonding.F) A) and B)
G) B) and D)

Question 13

Which one of the following is a function of proteins?

Accepted Answer

A)   energy storage
B)   enzymatic activity
C)   genetic coding
D)   energy source
E)   insulationF) B) and E)
G) C) and D)

Question 14

Wood and cotton cloth are composed of

Accepted Answer

A)   chitin.
B)   cellulose.
C)   glycogen.
D)   cholesterol.
E)   lipid. Plant cell walls contain cellulose and therefore it will be found in any plants or plant products.F) D) and E)
G) A) and B)

Question 15

Which of the following elements would be found in a carbohydrate?

Accepted Answer

A)   C, H
B)   C, H, O
C)   C, H, O, P
D)   C, H, O, N
E)   C, H, Cl, O Carbohydrates are organic molecules comprised of the elements carbon, hydrogen, and oxygen.F) D) and E)
G) A) and B)

Question 16

Which of the following is not associated with proteins?

Accepted Answer

A)   Proteins are made up of amino acids bonded together.
B)   Denaturation destroys proteins' shape and function.
C)   Proteins are used to produce DNA.
D)   Proteins are found in skin, nails, and claws.
E)   Proteins are used to produce many types of hormones. DNA is made from nucleotide monomers. DNA is used to code for the specific amino acids to be sequenced to produce a protein.F) None of the above
G) A) and C)

Question 17

A starch molecule is to glucose as

Accepted Answer

A)   a protein is to a polypeptide.
B)   DNA is to an amino acid.
C)   a lipid is to nucleic acid.
D)   a protein is to an amino acid.
E)   fatty acid is to a fat. Starch is a polymer and glucose is a monomer. This is the same case when comparing a protein to an amino acid.F) A) and B)
G) C) and D)

Question 18

A polypeptide forms a pleated sheet or a helix as its primary structure.

Accepted Answer

A) True 
 B)False

Question 19

Which functional group is present in amino acids?

Accepted Answer

A)   PO4
B)   -OH
C)   -NH2
D)   -C=OH
E)   -C-H -NH2, the monomer building block to protein production, is the functional group that is part of all amino acids.F) D) and E)
G) A) and B)

Question 20

Which of the following is least likely to be affected when a protein is denatured?

Accepted Answer

A)   primary structure
B)   secondary structure
C)   tertiary structure
D)   quaternary structure
E)   the folded shape of the proteinF) B) and D)
G) A) and B) A

Exam 3: The Organic Molecules of Life

What is the function of a peptide bond?

Correct AnswerverifiedShow Answer

How are lipids different from other categories of biological molecules?

Correct AnswerverifiedShow Answer

The following figure represents which process?

Correct AnswerverifiedShow Answer

Select the incorrect association.

Correct AnswerverifiedD

What makes saturated triglycerides considerably less healthy than unsaturated ones?

Correct AnswerverifiedShow Answer

Which word does not belong with the others?

Correct AnswerverifiedShow Answer

Which of the following is not an organic molecule?

Correct AnswerverifiedA

Hydrolysis of sucrose, a disaccharide, results in

Correct AnswerverifiedShow Answer

A gene in DNA is the code for assembling a sequence of

Correct AnswerverifiedShow Answer

The principle role for sugars in living things is to

Correct AnswerverifiedShow Answer

What functional group makes a carbohydrate polar?

Correct AnswerverifiedShow Answer

The primary structure of a protein refers to the

Correct AnswerverifiedShow Answer

Which one of the following is a function of proteins?

Correct AnswerverifiedShow Answer

Wood and cotton cloth are composed of

Correct AnswerverifiedShow Answer

Which of the following elements would be found in a carbohydrate?

Correct AnswerverifiedShow Answer

Which of the following is not associated with proteins?

Correct AnswerverifiedShow Answer

A starch molecule is to glucose as

Correct AnswerverifiedShow Answer

A polypeptide forms a pleated sheet or a helix as its primary structure.

Correct AnswerverifiedShow Answer

Which functional group is present in amino acids?

Correct AnswerverifiedShow Answer

Which of the following is least likely to be affected when a protein is denatured?

Correct AnswerverifiedA

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A