Question 1

A monosaccharide that plays an important role in energy storage is a six-carbon sugar called:

Accepted Answer

A)  galactose.
B)  lactose.
C)  cellulose.
D)  glucose.
E)  sucrose.F) B) and C)
G) D) and E)

Question 2

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) A) and B)
G) C) and D)

Question 3

Proteins are polymers formed of structural units called:

Accepted Answer

A)  fatty acids.
B)  amino acids.
C)  nucleotides.
D)  phosphate groups.
E)  monosaccharides.F) C) and D)
G) B) and D)

Question 4

L-lysine is an essential amino acid and must be supplied in the diet.By comparison,the stereoisomer D-lysine is not biologically active.Why can your body only utilize one form?

Accepted Answer

A)  Since the L form and D form are enantiomers,they will bind together and inhibit utilization of the D form.
B)  Since the L form and D form are chiral molecules,they will bind together and inhibit utilization of the D form.
C)  Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes.
D)  Enzymes can only recognize a single,specific stereoisomer.E) A) and B)
F) B) and C)

Question 5

If all functional groups are removed from an organic molecule,leaving only a hydrocarbon chain,the molecule becomes a:

Accepted Answer

A)  Lipid
B)  Carbohydrate
C)  Protein
D)  Nucleic acidE) A) and B)
F) B) and D)

Question 6

Cellulose is composed of monomers of:

Accepted Answer

A)  ribose
B)  deoxyribose
C)  α-glucose
D)  β-glucoseE) None of the above
F) All of the above

Question 7

Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose.The aldehyde is used when glucose and fructose bind together to form sucrose,and the Benedict's test is negative.Starch contains a great deal of glucose but gives a negative Benedict's test because:

Accepted Answer

A)  all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent.
B)  starch is not soluble in water and cannot react with Benedict's reagent.
C)  glucose in starch has lost a carbon atom and cannot react with Benedict's reagent.
D)  only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent.E) C) and D)
F) B) and D)

Question 8

Sudan IV,a dye that binds to nonpolar molecules,is used to detect the presence of macromolecules in food.Sudan IV would test positive in the presence of what macromolecule?

Accepted Answer

A)  Starch
B)  DNA
C)  Chitin
D)  Hemoglobin
E)  FatsF) D) and E)
G) B) and D)

Question 9

Humans are unable to get metabolic energy from cellulose because:

Accepted Answer

A)  cellulose contains very little chemical energy.
B)  cellulose is not part of a normal diet.
C)  cellulose digesting enzymes are absent from the human gut.
D)  cellulose does not taste good.
E)  cellulose is present in large quantities in the gut.F) D) and E)
G) A) and B)

Question 10

Phospholipids are made up of:

Accepted Answer

A)  a glycerol and three fatty acids.
B)  four fused carbon rings.
C)  a phosphate,two fatty acids and a glycerol.
D)  five-carbon rings with two nonpolar tails.E) All of the above
F) B) and D)

Question 11

Amino acids are linked together by peptide bonds in a ________

Accepted Answer

A)  phospholipid.
B)  nucleic acid.
C)  polysaccharide.
D)  polypeptide.
E)  starch.F) D) and E)
G) B) and E)

Question 12

You label cells with a radioactive isotope of sulfur (35S) .The only molecules that would be radioactively labeled in these cells are:

Accepted Answer

A)  Lipids
B)  Proteins
C)  Carbohydrates
D)  Nucleic acidsE) A) and B)
F) B) and C)

Question 13

A bobcat is feeding on a white-tailed deer.It first eats the liver,which is rich in stored sugars.In what form would sugar be stored in the deer's liver?

Accepted Answer

A)  Glucose
B)  Maltose
C)  Glycogen
D)  Amylose
E)  CelluloseF) B) and E)
G) A) and B)

Question 14

DNA and RNA contain functional units known as:

Accepted Answer

A)  peptides.
B)  enzymes.
C)  amino acids.
D)  nucleotides.
E)  fatty acids.F) C) and D)
G) C) and E)

Question 15

Which of the following reactions is a hydrolysis reaction?

Accepted Answer

A)  A + H2O → B + C
B)  A + B → C + H2O
C)  A + B + H2O → C
D)  A → B + C+ H2OE) B) and D)
F) A) and C)

Question 16

Yogurt contains galactose and glucose,which are generated when bacterial enzymes act on milk sugars.What is the main source of the galactose in yogurt?

Accepted Answer

A)  Maltose
B)  Sucrose
C)  Lactose
D)  Fructose
E)  GlycogenF) A) and C)
G) A) and D)

Question 17

Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids.How many different types of amino acids are used to construct proteins?

Accepted Answer

A)  2
B)  20
C)  146
D)  200E) A) and D)
F) A) and C)

Question 18

Carbohydrates are polymers formed of structural units called:

Accepted Answer

A)  amino acids.
B)  fatty acids.
C)  nucleotides.
D)  glycerols.
E)  monosaccharides.F) B) and C)
G) None of the above

Question 19

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ________ side groups.

Accepted Answer

A)  nonpolar
B)  polar uncharged
C)  positively charged
D)  negatively chargedE) B) and C)
F) None of the above

Question 20

Denaturation disrupts the secondary and tertiary structure of proteins.However,denaturation is not strong enough to disrupt what interaction that is relevant to protein structure?

Accepted Answer

A)  hydrogen bonds
B)  ionic bonds
C)  van der Waals attraction
D)  hydrophobic exclusion
E)  peptide bondsF) A) and D)
G) A) and C)

Exam 3: The Chemical Building Blocks of Life

Amino acids are linked together by peptide bonds in a ________

Correct Answer
verified

Denaturation disrupts the secondary and tertiary structure of proteins.However,denaturation is not strong enough to disrupt what interaction that is relevant to protein structure?

Correct Answer
verified

L-lysine is an essential amino acid and must be supplied in the diet.By comparison,the stereoisomer D-lysine is not biologically active.Why can your body only utilize one form?

Correct Answer
verified

A bobcat is feeding on a white-tailed deer.It first eats the liver,which is rich in stored sugars.In what form would sugar be stored in the deer's liver?

Correct Answer
verified

Sudan IV,a dye that binds to nonpolar molecules,is used to detect the presence of macromolecules in food.Sudan IV would test positive in the presence of what macromolecule?

Correct Answer
verified

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ________ side groups.

Correct Answer
verified

You label cells with a radioactive isotope of sulfur (³⁵S) .The only molecules that would be radioactively labeled in these cells are:

Correct Answer
verified

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Correct Answer
verified

If all functional groups are removed from an organic molecule,leaving only a hydrocarbon chain,the molecule becomes a:

Correct Answer
verified

Correct Answer
verified

Phospholipids are made up of:

Correct Answer
verified

Humans are unable to get metabolic energy from cellulose because:

Correct Answer
verified

A monosaccharide that plays an important role in energy storage is a six-carbon sugar called:

Correct Answer
verified

Which of the following reactions is a hydrolysis reaction?

Correct Answer
verified

Proteins are polymers formed of structural units called:

Correct Answer
verified

Yogurt contains galactose and glucose,which are generated when bacterial enzymes act on milk sugars.What is the main source of the galactose in yogurt?

Correct Answer
verified

Carbohydrates are polymers formed of structural units called:

Correct Answer
verified

Cellulose is composed of monomers of:

Correct Answer
verified

Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids.How many different types of amino acids are used to construct proteins?

Correct Answer
verified

DNA and RNA contain functional units known as:

Correct Answer
verified

Exam 3: The Chemical Building Blocks of Life

Amino acids are linked together by peptide bonds in a ________

Correct AnswerverifiedShow Answer

Denaturation disrupts the secondary and tertiary structure of proteins.However,denaturation is not strong enough to disrupt what interaction that is relevant to protein structure?

Correct AnswerverifiedShow Answer

L-lysine is an essential amino acid and must be supplied in the diet.By comparison,the stereoisomer D-lysine is not biologically active.Why can your body only utilize one form?

Correct AnswerverifiedShow Answer

A bobcat is feeding on a white-tailed deer.It first eats the liver,which is rich in stored sugars.In what form would sugar be stored in the deer's liver?

Correct AnswerverifiedShow Answer

Sudan IV,a dye that binds to nonpolar molecules,is used to detect the presence of macromolecules in food.Sudan IV would test positive in the presence of what macromolecule?

Correct AnswerverifiedShow Answer

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ________ side groups.

Correct AnswerverifiedShow Answer

You label cells with a radioactive isotope of sulfur (35S) .The only molecules that would be radioactively labeled in these cells are:

Correct AnswerverifiedShow Answer

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Correct AnswerverifiedShow Answer

If all functional groups are removed from an organic molecule,leaving only a hydrocarbon chain,the molecule becomes a:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Phospholipids are made up of:

Correct AnswerverifiedShow Answer

Humans are unable to get metabolic energy from cellulose because:

Correct AnswerverifiedShow Answer

A monosaccharide that plays an important role in energy storage is a six-carbon sugar called:

Correct AnswerverifiedShow Answer

Which of the following reactions is a hydrolysis reaction?

Correct AnswerverifiedShow Answer

Proteins are polymers formed of structural units called:

Correct AnswerverifiedShow Answer

Yogurt contains galactose and glucose,which are generated when bacterial enzymes act on milk sugars.What is the main source of the galactose in yogurt?

Correct AnswerverifiedShow Answer

Carbohydrates are polymers formed of structural units called:

Correct AnswerverifiedShow Answer

Cellulose is composed of monomers of:

Correct AnswerverifiedShow Answer

Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids.How many different types of amino acids are used to construct proteins?

Correct AnswerverifiedShow Answer

DNA and RNA contain functional units known as:

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

You label cells with a radioactive isotope of sulfur (³⁵S) .The only molecules that would be radioactively labeled in these cells are:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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