Question 1

The feet of penguins and reindeer contain large amounts of unsaturated fatty acids.Why would these animals have these fats in their feet rather than saturated fats?

Accepted Answer

Triglycerides containing unsaturated fat...

Question 2

Which of the following carbohydrates would NOT be a molecule used for energy storage?

Accepted Answer

A)  starch
B)  cellulose
C)  glycogen
D)  All of the above are used for energy storageE) A) and B)
F) C) and D)

Question 3

A strand of DNA has the following base sequence: ATTGCGAATGGCA.Construct the complementary strand of DNA.

Accepted Answer

Adenine and thymine and cytosi...

Question 4

A saturated fat

Accepted Answer

A)  is often solid at room temperature.
B)  has fatty acids with no double bonds between the carbon atoms.
C)  is of animal origin.
D)  All of the choices are correct.E) A) and B)
F) A) and C)

Question 5

A polypeptide has an amino acid sequence of: alanine-leucine-tryptophan-glycine-valine-alanine. This chain of amino acids is further organized into a helix that 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-tryptophan-glycine-valine-alanine.E) None of the above
F) B) and C)

Question 6

The alpha helix and beta sheet are found at which level of protein organization?

Accepted Answer

A)  primary structure
B)  secondary structure
C)  tertiary structure
D)  quaternary structureE) A) and B)
F) A) and C)

Question 7

If an animal needed to store energy for long-term use which of the following would be the best choice?

Accepted Answer

A)  fructose and glucose in the form of honey
B)  fat molecules
C)  complex cellulose molecules
D)  starch
E)  glycogen with extensive side branches of glucoseF) A) and B)
G) A) and C)

Question 8

Construct a portion of cell membrane using the typical phospholipid symbols.Indicate the location of the cytoplasm and outside of the cell.Explain how the chemical characteristics of phospholipid molecules dictate membrane structure and cause it to be fluid in nature.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> A bilayer forms due to the chemical nat...

Question 9

Which statement below correctly describes why ATP is a high energy structure?

Accepted Answer

A)  ATP contains two phosphate bonds that contain high levels of energy.
B)  ATP contains hydro-carbon chains that hold energy.
C)  ATP is composed of thymine which is a high energy molecule.
D)  ATP has three phosphate bonds,two of which are unstable and easily broken.
E)  ATP has three phosphate bonds that are very stable and difficult to break.F) A) and C)
G) A) and E)

Question 10

How many molecules of water are used during hydrolysis to break the following polypeptide into its constituent amino acids: alanine-leucine-tryptophan-glycine-valine-alanine?

Accepted Answer

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

Question 11

If a DNA molecule contains 20% guanine,how much cytosine will the DNA molecule contain?

Accepted Answer

Guanine complementary base pai...

Question 12

Fish sperm is composed mostly of DNA.If we tested a sample chemically,we should find relatively high amounts of

Accepted Answer

A)  nitrogenous bases,sugar,and phosphate groups.
B)  phospholipids and steroids.
C)  amino acids and unsaturated fats.
D)  triglycerides and ATP.
E)  globular proteins and stored fats.F) B) and C)
G) A) and D)

Question 13

Which carbohydrate is used to store energy in the liver?

Accepted Answer

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

Question 14

A hydrocarbon is hydrophobic

Accepted Answer

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

Question 15

Starch is a polysaccharide that stores energy in animal cells.

Accepted Answer

A) True 
 B)False

Question 16

A triglyceride is a polymer made up of which kind of subunits?

Accepted Answer

A)  glucose or modified glucose molecules
B)  amino acids
C)  nucleotides
D)  alternating sugar and phosphate groups
E)  fatty acids and glycerolF) C) and D)
G) B) and E)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

Identify this molecule:

Accepted Answer

A)  amino acid
B)  hydrocarbon
C)  carbohydrate
D)  alcohol
E)  lipidF) All of the above
G) C) and E)

Question 19

At the molecular level,cells from different types of organisms vary in their tolerance to temperature and pH.This variation can mostly likely be attributed to

Accepted Answer

A)  the types of enzymes present in the cells.
B)  ATP efficiency.
C)  ability of the cells to form glucose polymers.
D)  replication of nucleic acids.
E)  extent of saturation of fatty acids.F) A) and E)
G) All of the above

Question 20

What are the basic structures that make up a nucleotide?

Accepted Answer

A)  pentose sugar,phosphate,and nitrogen-containing base
B)  pentose sugar,nitrate,and phosphorus-containing base
C)  pentose sugar,phosphate,and sulfur-containing base
D)  hydroxide group,phosphate,and nitrogen-containing base
E)  pentose sugar,sodium,and nitrogen-containing baseF) B) and D)
G) None of the above

Exam 3: The Chemistry of Organic Molecules

The alpha helix and beta sheet are found at which level of protein organization?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a DNA molecule contains 20% guanine,how much cytosine will the DNA molecule contain?

Correct AnswerverifiedGuanine complementary base pai...View AnswerShow Answer

If an animal needed to store energy for long-term use which of the following would be the best choice?

Correct AnswerverifiedShow Answer

What are the basic structures that make up a nucleotide?

Correct AnswerverifiedShow Answer

The feet of penguins and reindeer contain large amounts of unsaturated fatty acids.Why would these animals have these fats in their feet rather than saturated fats?

Correct AnswerverifiedTriglycerides containing unsaturated fat...View AnswerShow Answer

How many molecules of water are used during hydrolysis to break the following polypeptide into its constituent amino acids: alanine-leucine-tryptophan-glycine-valine-alanine?

Correct AnswerverifiedShow Answer

A triglyceride is a polymer made up of which kind of subunits?

Correct AnswerverifiedShow Answer

Which of the following carbohydrates would NOT be a molecule used for energy storage?

Correct AnswerverifiedShow Answer

Fish sperm is composed mostly of DNA.If we tested a sample chemically,we should find relatively high amounts of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Construct a portion of cell membrane using the typical phospholipid symbols.Indicate the location of the cytoplasm and outside of the cell.Explain how the chemical characteristics of phospholipid molecules dictate membrane structure and cause it to be fluid in nature.

Correct Answerverified A bilayer forms due to the chemical nat...View AnswerShow Answer

A saturated fat

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Which statement below correctly describes why ATP is a high energy structure?

Correct AnswerverifiedShow Answer

Identify this molecule:

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Which carbohydrate is used to store energy in the liver?

Correct AnswerverifiedShow Answer

A strand of DNA has the following base sequence: ATTGCGAATGGCA.Construct the complementary strand of DNA.

Correct AnswerverifiedAdenine and thymine and cytosi...View AnswerShow Answer

At the molecular level,cells from different types of organisms vary in their tolerance to temperature and pH.This variation can mostly likely be attributed to

Correct AnswerverifiedShow Answer

Starch is a polysaccharide that stores energy in animal cells.

Correct AnswerverifiedShow Answer

A hydrocarbon is hydrophobic

Correct AnswerverifiedShow Answer

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Guanine complementary base pai...
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Triglycerides containing unsaturated fat...
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A bilayer forms due to the chemical nat...
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Adenine and thymine and cytosi...
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