Bioportal Ch. 3

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1.| Which of the following biological molecules is/are linked by covalent bonds formed by the removal of the elements of water from the reactants (a kind of condensation reaction)?| | A.| Oils|

B.| Waxes|
C.| Proteins|
D.| Starch|
E.| All of the above|
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Incorrect
See Section 3.2: What Are the Chemical Structures and Functions of Proteins? | Points Earned:| 0/1|
Correct Answer:| E|
Your Response:| D|
2.| There are a number of functional groups in biological molecules. Which of the following statements about their presence in different classes of molecules is most accurate?| | A.| Hydroxyl groups are only present in carbohydrates.| B.| Aldehyde groups are common in proteins.|

C.| Amino groups may be found in modified carbohydrates as well as in proteins.| D.| Carboxyl groups are found only in small molecules.|
E.| Sulfhydryl groups are common in fats.|
|
Incorrect
See Section 3.1: What Kinds of Molecules Characterize Living Things? | Points Earned:| 0/1|
Correct Answer:| C|
Your Response:| A|
3.| Where would the leucine side chain most likely be found in a protein dissolved in water?| | A.| In the interior of the protein in contact with nonpolar side chains| B.| In the interior of the protein in contact with polar side chains| C.| On the exterior of the protein|

D.| In the interior of the protein in contact with water| E.| Either on the interior or exterior of the protein|
|
Correct
See Section 3.2: What Are the Chemical Structures and Functions of Proteins? | Points Earned:| 1/1|
Correct Answer:| A|
Your Response:| A|
4.| Molecular chaperones|
| A.| are small molecules|
B.| are made in decreased amounts after exposure of an organism to high temperatures.| C.| are absent in insects.|
D.| can prevent harmful interactions by improperly folded proteins.| E.| bind proteins irreversibly.|
|
Incorrect
See Section 3.2: What Are the Chemical Structures and Functions of Proteins? | Points Earned:| 0/1|
Correct Answer:| D|
Your Response:| E|
5.| Which of the following amino acids would, when incorporated into a polypeptide chain (not at the N or C terminus), make the charge of the polypeptide more positive?| | A.| Alanine|
B.| Arginine|
C.| Aspartate|
D.| Serine|
E.| Cysteine|
|
Correct
See Section 3.2: What Are the Chemical Structures and Functions of Proteins? | Points Earned:| 1/1|
Correct Answer:| B|
Your Response:| B|
6.| The “building blocks” of polysaccharides are _______ and the blocks are covalently linked together by _______ bonds.| | A.| glycerol and fatty acids; ester|
B.| amino acids; peptide|
C.| monosaccharides; glycosidic|
D.| monosaccharides; ester|
E.| disaccharides; glycosidic|
|
Correct
See Section 3.3: What Are the Chemical Structures and Functions of Carbohydrates? | Points Earned:| 1/1|
Correct Answer:| C|
Your Response:| C|
7.| The primary structure of proteins is the _______. The primary structure contains the information necessary for the formation of secondary structure, including the _______ and the _______. Secondary structure of proteins is stabilized by the formation of _______ bonds.| | A.| amino acid sequence; β pleated sheet; α helix; disulfide| B.| α helix; amino acid sequence; β pleated sheet; hydrophobic| C.| amino acid sequence; α helix; β pleated sheet; hydrogen| D.| amino acid sequence; α helix; β pleated sheet; peptide| E.| β pleated sheet; α helix; amino acid sequence; hydrogen|

|
Correct
See Section 3.2: What Are the Chemical Structures and Functions of Proteins? | Points Earned:| 1/1|
Correct Answer:| C|
Your Response:| C|
8.| Oils and fats|
| A.| form membranes.|
B.| are triglycerides.|
C.| all contain the same fatty acids.|
D.| are good for you in large amounts.|
E.| have peptide bonds.|
|...
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