Question 1

Glucose (C6H12O6) can exist as both an open-chain form and a closed-ring form.Before 1900,glucose was only thought to occur as an open chain.Now we know that over 99 percent of the time,glucose occurs in the closed-ring form.What possible difference between these forms would give chemists a clue that the open-chain form was not present?

Accepted Answer

A)  Open-chain molecules can form polymers and glucose does not.
B)  Only open-chain forms can undergo condensation,which does not occur with glucose.
C)  An open chain presents ends with functional groups (in this case aldehyde) ,and glucose failed to undergo typical aldehyde reactions; a phenomenon that could be explained by having no end functional group in a ring structure.
D)  Because glucose is solid at room temperature,it must have saturated hydrocarbon chains.
E)  Glucose could not be "denatured" so it must be a tight chain.F) A) and B)
G) B) and E)

Question 2

A hydrocarbon is hydrophobic

Accepted Answer

A)  at all times.
B)  only in the living cell environment.
C)  except when it has an attached ionized functional group.
D)  in carbohydrates but not in lipids.E) All of the above
F) C) and D)

Question 3

A polypeptide has an amino acid sequence of: alanine-leucine-tryptophane-glycien-valine-alanine. This chain of amino acids is further organized into a helix that in-turn,folds in and around itself to form a globular structure.The primary structure of this polypeptide is:

Accepted Answer

A)  globular
B)  pleated-sheet
C)  alpha helix
D)  alanine-leucine-tryptophane-glycien-valine-alanineE) C) and D)
F) None of the above D

Question 4

Which Figure is that of an unsaturated fat?

Accepted Answer

A)  Figure A
B)  Figure BC) A) and B)
D) undefined

Question 5

Identify the following molecule:

Accepted Answer

A)  amino acid
B)  hydrocarbon
C)  carbohydrate
D)  alcohol
E)  cholesterolF) C) and D)
G) A) and B)

Question 6

Due to an increased risk of heart disease many doctors have suggested shifting our diet to include more oils instead of fats.As you cook dinner tonight the recipe calls for 2 tbs of oil.What is the most likely source of the oil you used in preparing your meal?

Accepted Answer

A)  canola or olives
B)  bees wax distilled down to an oil form
C)  melted butter
D)  lard that was left out at room temperature
E)  none of these choices are oilsF) B) and D)
G) C) and E)

Question 7

Starch is a protein that serves in energy storage in plant cells.

Accepted Answer

A) True 
 B)False

Question 8

Which carbohydrate is used in the liver for energy storage?

Accepted Answer

A)  starch
B)  chitin
C)  cellulose
D)  glycogen
E)  glycerolF) A) and E)
G) B) and D)

Question 9

Migratory birds store energy as glycogen which is lighter than fat.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following functional groups represents sulfhydryl?

Accepted Answer

A)  SH
B)  H-N-H
C)  OH
D)  0=C-OH
E)  C=OF) B) and E)
G) C) and D)

Question 11

Which carbohydrate is found in the cell walls of plants?

Accepted Answer

A)  starch
B)  chitin
C)  cellulose
D)  glycogen
E)  glycerolF) C) and D)
G) A) and C)

Question 12

Organic molecules are those that contain at least

Accepted Answer

A)  carbon.
B)  carbon and oxygen.
C)  carbon and hydrogen.
D)  carbon,oxygen,and hydrogen.E) None of the above
F) B) and C)

Question 13

Which statement is true about RNA?

Accepted Answer

A)  It contains adenine paired to thymine.
B)  One of the bases from DNA is replaced by uracil.
C)  It contains the sugar deoxyribose.
D)  Its nucleotides contain twice as many phosphate groups as DNA's nucleotides.
E)  It is a double-stranded molecule.F) A) and E)
G) C) and D)

Question 14

Choose the Figure that depicts polymer synthesis.

Accepted Answer

A)  Figure 1
B)  Figure 2C) A) and B)
D) undefined

Question 15

Which of the following is NOT a protein function?

Accepted Answer

A)  support
B)  transportation
C)  defense
D)  motion
E)  insulationF) A) and B)
G) A) and D)

Question 16

If an animal needed to store energy for long-term use,but not be encumbered with the weight of extra tissue,which is the best molecule for storage?

Accepted Answer

A)  fructose and glucose in the form of honey
B)  high-calorie fat molecules
C)  complex cellulose molecules
D)  starch
E)  glycogen with extensive side branches of glucoseF) None of the above
G) C) and E) B

Question 17

How many molecules of water are used to degrade this polypeptide,using hydrolysis reactions,into its constituent amino acids: alanine-leucine-tryptophane-glycine-valine-alanine?

Accepted Answer

A)  six
B)  five
C)  one
D)  sevenE) A) and D)
F) C) and D)

Question 18

Which functional group will attach to a hydrocarbon chain to form alcohol?

Accepted Answer

A)  hydroxyl
B)  carbonyl
C)  carboxyl
D)  amino
E)  phosphateF) A) and E)
G) B) and D)

Question 19

A peptide bond is found in which type of biological molecule?

Accepted Answer

A)  carbohydrate
B)  lipid
C)  nucleic acid
D)  proteinE) A) and B)
F) B) and C)

Question 20

A dehydration reaction can also be called a (an) _________ reaction since it forms water.

Accepted Answer

A)  condensation
B)  hydrolysis
C)  isomeric
D)  an energy-releasing
E)  monomer formationF) B) and E)
G) B) and D) A

Exam 3: The Chemistry of Organic Molecules

Correct Answer
verified

A hydrocarbon is hydrophobic

Correct Answer
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A polypeptide has an amino acid sequence of: alanine-leucine-tryptophane-glycien-valine-alanine. This chain of amino acids is further organized into a helix that in-turn,folds in and around itself to form a globular structure.The primary structure of this polypeptide is:

Correct Answer
verified
D

Which Figure is that of an unsaturated fat?

Correct Answer
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Identify the following molecule:

Correct Answer
verified

Due to an increased risk of heart disease many doctors have suggested shifting our diet to include more oils instead of fats.As you cook dinner tonight the recipe calls for 2 tbs of oil.What is the most likely source of the oil you used in preparing your meal?

Correct Answer
verified

Starch is a protein that serves in energy storage in plant cells.

Correct Answer
verified

Which carbohydrate is used in the liver for energy storage?

Correct Answer
verified

Migratory birds store energy as glycogen which is lighter than fat.

Correct Answer
verified

Which of the following functional groups represents sulfhydryl?

Correct Answer
verified

Which carbohydrate is found in the cell walls of plants?

Correct Answer
verified

Organic molecules are those that contain at least

Correct Answer
verified

Which statement is true about RNA?

Correct Answer
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Choose the Figure that depicts polymer synthesis.

Correct Answer
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Which of the following is NOT a protein function?

Correct Answer
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If an animal needed to store energy for long-term use,but not be encumbered with the weight of extra tissue,which is the best molecule for storage?

Correct Answer
verified
B

How many molecules of water are used to degrade this polypeptide,using hydrolysis reactions,into its constituent amino acids: alanine-leucine-tryptophane-glycine-valine-alanine?

Correct Answer
verified

Which functional group will attach to a hydrocarbon chain to form alcohol?

Correct Answer
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A peptide bond is found in which type of biological molecule?

Correct Answer
verified

A dehydration reaction can also be called a (an) _________ reaction since it forms water.

Correct Answer
verified
A

Exam 3: The Chemistry of Organic Molecules

Correct AnswerverifiedShow Answer

A hydrocarbon is hydrophobic

Correct AnswerverifiedShow Answer

A polypeptide has an amino acid sequence of: alanine-leucine-tryptophane-glycien-valine-alanine. This chain of amino acids is further organized into a helix that in-turn,folds in and around itself to form a globular structure.The primary structure of this polypeptide is:

Correct AnswerverifiedD

Which Figure is that of an unsaturated fat?

Correct AnswerverifiedShow Answer

Identify the following molecule:

Correct AnswerverifiedShow Answer

Due to an increased risk of heart disease many doctors have suggested shifting our diet to include more oils instead of fats.As you cook dinner tonight the recipe calls for 2 tbs of oil.What is the most likely source of the oil you used in preparing your meal?

Correct AnswerverifiedShow Answer

Starch is a protein that serves in energy storage in plant cells.

Correct AnswerverifiedShow Answer

Which carbohydrate is used in the liver for energy storage?

Correct AnswerverifiedShow Answer

Migratory birds store energy as glycogen which is lighter than fat.

Correct AnswerverifiedShow Answer

Which of the following functional groups represents sulfhydryl?

Correct AnswerverifiedShow Answer

Which carbohydrate is found in the cell walls of plants?

Correct AnswerverifiedShow Answer

Organic molecules are those that contain at least

Correct AnswerverifiedShow Answer

Which statement is true about RNA?

Correct AnswerverifiedShow Answer

Choose the Figure that depicts polymer synthesis.

Correct AnswerverifiedShow Answer

Which of the following is NOT a protein function?

Correct AnswerverifiedShow Answer

If an animal needed to store energy for long-term use,but not be encumbered with the weight of extra tissue,which is the best molecule for storage?

Correct AnswerverifiedB

How many molecules of water are used to degrade this polypeptide,using hydrolysis reactions,into its constituent amino acids: alanine-leucine-tryptophane-glycine-valine-alanine?

Correct AnswerverifiedShow Answer

Which functional group will attach to a hydrocarbon chain to form alcohol?

Correct AnswerverifiedShow Answer

A peptide bond is found in which type of biological molecule?

Correct AnswerverifiedShow Answer

A dehydration reaction can also be called a (an) _________ reaction since it forms water.

Correct AnswerverifiedA

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D

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B

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A