Question 1

A molecule with the formula C₁₈H₃₆O₂ is probably a

Accepted Answer

A)  carbohydrate.
B)  fatty acid.
C)  protein.
D)  nucleic acid.
E)  hydrocarbon.F) B) and E)
G) C) and E)

Question 2

Which of the following statements concerning saturated fats is not true?

Accepted Answer

A)  They are more common in animals than in plants.
B)  They have multiple double bonds in the carbon chains of their fatty acids.
C)  They generally solidify at room temperature.
D)  They contain more hydrogen than unsaturated fats having the same number of carbon atoms.
E)  They are one of several factors that contribute to atherosclerosis.F) A) and C)
G) B) and C)

Question 3

-Which of the following statements is/are true regarding the chemical reaction illustrated in the figure above?

Accepted Answer

A)  It is a hydrolysis reaction.
B)  It results in a peptide bond.
C)  It joins two fatty acids together.
D)  It is a hydrolysis reaction and it results in a peptide bond.
E)  It is a hydrolysis reaction, it results in a peptide bond, and it joins two fatty acids together.F) A) and B)
G) A) and D)

Question 4

DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?

Accepted Answer

A)  The two strands of the double helix would separate.
B)  The phosphodiester bonds between deoxyribose sugars would be broken.
C)  The purines would be separated from the deoxyribose sugars.
D)  The pyrimidines would be separated from the deoxyribose sugars.
E)  All bases would be separated from the deoxyribose sugars.F) B) and C)
G) None of the above

Question 5

The amino acids of the protein keratin are arranged predominantly in an α helix. This secondary structure is stabilized by

Accepted Answer

A)  covalent bonds.
B)  peptide bonds.
C)  ionic bonds.
D)  polar bonds.
E)  hydrogen bonds.F) B) and D)
G) D) and E)

Question 6

The tertiary structure of a protein is the

Accepted Answer

A)  bonding together of several polypeptide chains by weak bonds.
B)  order in which amino acids are joined in a polypeptide chain.
C)  unique three-dimensional shape of the fully folded polypeptide.
D)  organization of a polypeptide chain into an α helix or β pleated sheet.
E)  overall protein structure resulting from the aggregation of two or more polypeptide subunits.F) B) and C)
G) D) and E)

Question 7

The covalent bond formed between two monosaccharides by way of dehydration is called a(n)

Accepted Answer

A)  hydrogen bond.
B)  sulphide bridge.
C)  glycosidic link.
D)  glucose bridge.
E)  disaccharide link.F) A) and E)
G) All of the above

Question 8

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all.
 
-Which molecule is a saturated fatty acid?

Accepted Answer

A)  1
B)  5
C)  6
D)  8
E)  9F) All of the above
G) C) and E)

Question 9

How will brief heating (to 95°C) affect macromolecular structures in aqueous solution?

Accepted Answer

A)  DNA duplexes will unwind and separate.
B)  Proteins will unfold (denature) .
C)  Starch will hydrolyze into monomeric sugars.
D)  Proteins will hydrolyze into amino acids.
E)  DNA duplexes will unwind and separate, and proteins will unfold (denature) .F) A) and B)
G) All of the above

Question 10

Which of the following is not a monomer/polymer pairing?

Accepted Answer

A)  monosaccharide/polysaccharide
B)  amino acid/protein
C)  triglyceride/phospholipid bilayer
D)  deoxyribonucleotide/DNA
E)  ribonucleotide/RNAF) C) and D)
G) A) and D)

Question 11

Use the following information to answer the questions below.
You have just had a breakfast of toast (high-fibre bread)  with butter and jam (no added sugar)  along with a glass of milk.
-The structural level of a protein least affected by a disruption in hydrogen bonding is the

Accepted Answer

A)  primary level.
B)  secondary level.
C)  tertiary level.
D)  quaternary level.
E)  All structural levels are equally affected.F) All of the above
G) A) and B)

Question 12

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all.
 
-Which of the following molecules contains a glycosidic linkage type of covalent bond?

Accepted Answer

A)  4
B)  6
C)  12
D)  13
E)  15F) C) and E)
G) B) and D)

Question 13

What aspects of protein structure are stabilized or assisted by hydrogen bonds?

Accepted Answer

A)  primary structure
B)  secondary structure
C)  tertiary structure
D)  quaternary structure
E)  secondary, tertiary, and quaternary structures, but not primary structureF) None of the above
G) A) and B)

Question 14

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all.
 
-Which of the following molecules has a functional group that frequently forms covalent bonds that maintain the tertiary structure of a protein?

Accepted Answer

A)  2
B)  3
C)  7
D)  8
E)  9F) A) and E)
G) C) and D)

Question 15

Polysaccharides, triacylglycerides, and proteins are similar in that they

Accepted Answer

A)  are synthesized from monomers by the process of hydrolysis.
B)  are synthesized from subunits by dehydration reactions.
C)  are synthesized as a result of peptide bond formation between monomers.
D)  are decomposed into their subunits by dehydration reactions.
E)  all contain nitrogen in their monomer building blocks.F) C) and D)
G) B) and E)

Question 16

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all.
 
-Which of the following molecules is an amino acid with a hydrophobic R group or side chain?

Accepted Answer

A)  3
B)  7
C)  8
D)  12
E)  13F) C) and E)
G) A) and D)

Question 17

Which of the four classes of biological molecules is not a polymer and thus isn't formed by dehydration?

Accepted Answer

A)  carbohydrates
B)  lipids
C)  proteins
D)  nucleic acids
E)  All can be considered polymers.F) D) and E)
G) A) and E)

Question 18

Use the following information to answer the questions below.
You have just had a breakfast of toast (high-fibre bread)  with butter and jam (no added sugar)  along with a glass of milk.
-Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?

Accepted Answer

A)  5'-purine-pyrimidine-purine-pyrimidine-3' with 3'-purine-pyrimidine-purine-pyrimidine-5'
B)  5'-AGCT-3' with 5'-TCGA-3'
C)  5'-GCGC-3' with 5'-TATA-3'
D)  5'-ATGC-3' with 5'-GCAT-3'
E)  All of these pairs are correct.F) B) and E)
G) C) and D)

Question 19

Which class of biological molecules are grouped together because they are hydrophobic?

Accepted Answer

A)  carbohydrates
B)  lipids
C)  proteins
D)  nucleic acids
E)  This is not a criterion for grouping molecules.F) A) and E)
G) None of the above

Question 20

A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of

Accepted Answer

A)  120 adenine and 120 uracil molecules.
B)  120 thymine and 120 adenine molecules.
C)  120 cytosine and 120 thymine molecules.
D)  120 adenine and 120 cytosine molecules.
E)  120 guanine and 120 thymine molecules.F) B) and E)
G) A) and C)

Exam 5: The Structure and Function of Large Biological Molecules

A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of

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The amino acids of the protein keratin are arranged predominantly in an α helix. This secondary structure is stabilized by

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Use the following information to answer the questions below. You have just had a breakfast of toast (high-fibre bread) with butter and jam (no added sugar) along with a glass of milk. -The structural level of a protein least affected by a disruption in hydrogen bonding is the

Correct AnswerverifiedShow Answer

A molecule with the formula C₁₈H₃₆O₂ is probably a

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The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all. -Which of the following molecules has a functional group that frequently forms covalent bonds that maintain the tertiary structure of a protein?

Correct AnswerverifiedShow Answer

The tertiary structure of a protein is the

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Which class of biological molecules are grouped together because they are hydrophobic?

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The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all. -Which of the following molecules contains a glycosidic linkage type of covalent bond?

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Which of the following statements concerning saturated fats is not true?

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How will brief heating (to 95°C) affect macromolecular structures in aqueous solution?

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-Which of the following statements is/are true regarding the chemical reaction illustrated in the figure above?

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Which of the following is not a monomer/polymer pairing?

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DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?

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The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all. -Which molecule is a saturated fatty acid?

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What aspects of protein structure are stabilized or assisted by hydrogen bonds?

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The covalent bond formed between two monosaccharides by way of dehydration is called a(n)

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Use the following information to answer the questions below. You have just had a breakfast of toast (high-fibre bread) with butter and jam (no added sugar) along with a glass of milk. -Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?

Correct AnswerverifiedShow Answer

Polysaccharides, triacylglycerides, and proteins are similar in that they

Correct AnswerverifiedShow Answer

Which of the four classes of biological molecules is not a polymer and thus isn't formed by dehydration?

Correct AnswerverifiedShow Answer

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all. -Which of the following molecules is an amino acid with a hydrophobic R group or side chain?

Correct AnswerverifiedShow Answer

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