Question 1

It is important to have cholesterol in your body because ________.

Accepted Answer

A)   it is the starting material for the building of glycogen
B)   the brain is made almost entirely of cholesterol
C)   it helps break down extra fat lipids in the body
D)   it serves as the starting material for the biosynthesis of most all other steroidsE) B) and C)
F) None of the above

Question 2

Which of the following statements describes most monosaccharides?

Accepted Answer

A)   They are composed of carbon, hydrogen and oxygen with each carbon bound to at least one oxygen.
B)   They are insoluble.
C)   They are considered to be unsaturated compounds.
D)   They are rarely found as monomers in nature.
E)   all of the aboveF) All of the above
G) B) and C)

Question 3

Which of the following statements about proteins is true?

Accepted Answer

A)   The simpler an amino acid is, the more likely it is to be generated within the body.
B)   All of the amino acids in the human body can be synthesized by our cells.
C)   The source of a protein (mammal, fish, or poultry)  has little effect on nutritional value.
D)   All of the above are true.
E)   None of the above are true.F) A) and E)
G) B) and C)

Question 4

How many nucleotides does it take to code a single amino acid?

Accepted Answer

A)   3
B)   2
C)   1
D)   40
E)   20F) A) and D)
G) B) and E)

Question 5

Which of the following statements describes a cellular activity that happens during both transcription and translation?

Accepted Answer

A)   Nucleotides bind to complimentary bases.
B)   The DNA helix opens up.
C)   Transfer RNA is used to link peptides.
D)   Protein is formed.
E)   none of the aboveF) All of the above
G) A) and B)

Question 6

What is one physical property that readily distinguishes lipids from other biological molecules?

Accepted Answer

A)   Lipids are insoluble in water.
B)   Lipids have very high melting points.
C)   Lipids are readily oxidized.
D)   Lipids form water soluble positive ions.
E)   none of the aboveF) B) and D)
G) C) and D)

Question 7

How are disaccharides and monosaccharides related?

Accepted Answer

A)   A disaccharide is composed of two monosaccharide units.
B)   A disaccharide is composed of two of the same monosaccharide units.
C)   Two disaccharides are combined to form a monosaccharide.
D)   Two different disaccharides are combined to form a monosaccharide.
E)   Two of the same disaccharides are combined to form a monosaccharide.F) None of the above
G) B) and E)

Question 8

Two of the most abundant minerals in our diet are ________.

Accepted Answer

A)   ions
B)   atoms
C)   molecules
D)   non-metalsE) B) and C)
F) C) and D)

Question 9

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 aboveF) B) and E)
G) None of the above

Question 10

Proteins are ________ that have some biological function in living systems.

Accepted Answer

A)   polypeptides
B)   monomers
C)   starches
D)   hormones
E)   none of the aboveF) C) and E)
G) B) and D)

Question 11

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 aboveF) A) and B)
G) C) and D)

Question 12

Cold cereal is often fortified with all sorts of vitamins and minerals but is deficient in the amino acid lysine. How might this deficiency be compensated for?

Accepted Answer

A)   eat a peanut butter sandwich at lunch
B)   have beans with your dinner
C)   pour milk on your cereal
D)   all of the aboveE) None of the above
F) B) and C)

Question 13

What functional groups are found in all amino acids?

Accepted Answer

A)   amines and carboxylic acids
B)   phenols and amines
C)   alcohols and amides
D)   aminos and acids
E)   ketones and aldehydesF) B) and C)
G) A) and B)

Question 14

What is the main compound formed in the digestion of carbohydrates?

Accepted Answer

A)   glucose
B)   sugar
C)   ribose
D)   glycogen
E)   none of the aboveF) None of the above
G) A) and E)

Question 15

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-CysE) C) and D)
F) A) and D)

Question 16

You are a beautician about to apply a reducing agent to a customer with fine hair who wants to have his hair curly. Should the reducing agent be regular strength, concentrated, or diluted?

Accepted Answer

A)   regular strength
B)   concentrated, because in thin hair each strand is made of fewer cysteine amino acids
C)   dilute, so as not to cause the hair to fall apart completely
D)   concentrated, in order to add more disulfide cross-linkingE) A) and B)
F) A) and C)

Question 17

What is an obvious physical difference between saturated and unsaturated fats?

Accepted Answer

A)   Saturated fats are usually solids while unsaturated fats are usually liquids.
B)   Saturated fats are soluble in water while unsaturated are not.
C)   Unsaturated fats are soluble in water while unsaturated fats are not.
D)   Saturated fats burn cleaner than unsaturated fats.
E)   none of the aboveF) B) and C)
G) C) and D)

Question 18

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 aboveF) B) and E)
G) B) and C)

Question 19

Starch is a polysaccharide that ________.

Accepted Answer

A)   is made by plants to store energy
B)   is made by animals to store energy
C)   is an insoluble fiber
D)   aids in the digestion process
E)   none of the aboveF) A) and B)
G) B) and E)

Question 20

Which of the following plays the most active role in protein manufacture?

Accepted Answer

A)   DNA
B)   RNA
C)   genes
D)   nucleotides
E)   none of the aboveF) A) and E)
G) C) and D)

Exam 13: Nutrients of Life

How do inhibitors work to prevent an enzyme from functioning?

Correct AnswerverifiedShow Answer

Which of the following statements describes most monosaccharides?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

What is an obvious physical difference between saturated and unsaturated fats?

Correct AnswerverifiedShow Answer

It is important to have cholesterol in your body because ________.

Correct AnswerverifiedShow Answer

Which of the following statements describes a cellular activity that happens during both transcription and translation?

Correct AnswerverifiedShow Answer

What is the main compound formed in the digestion of carbohydrates?

Correct AnswerverifiedShow Answer

You are a beautician about to apply a reducing agent to a customer with fine hair who wants to have his hair curly. Should the reducing agent be regular strength, concentrated, or diluted?

Correct AnswerverifiedShow Answer

Which of the following statements about proteins is true?

Correct AnswerverifiedShow Answer

What functional groups are found in all amino acids?

Correct AnswerverifiedShow Answer

Which of the following plays the most active role in protein manufacture?

Correct AnswerverifiedShow Answer

Cold cereal is often fortified with all sorts of vitamins and minerals but is deficient in the amino acid lysine. How might this deficiency be compensated for?

Correct AnswerverifiedShow Answer

Proteins are ________ that have some biological function in living systems.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many nucleotides does it take to code a single amino acid?

Correct AnswerverifiedShow Answer

Two of the most abundant minerals in our diet are ________.

Correct AnswerverifiedShow Answer

How are disaccharides and monosaccharides related?

Correct AnswerverifiedShow Answer

Starch is a polysaccharide that ________.

Correct AnswerverifiedShow Answer

What is one physical property that readily distinguishes lipids from other biological molecules?

Correct AnswerverifiedShow Answer

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