Question 1

-Phospholipids are important components of the plasma membrane.What does "A" represent on the diagram?

Accepted Answer

A)  phosphorus
B)  oxygen
C)  nitrogen
D)  polar (hydrophilic) region
E)  nonpolar (hydrophobic) regionF) C) and D)
G) A) and B)

Question 2

Chemical energy

Accepted Answer

A)  moves matter.
B)  results from the position or movement of objects.
C)  is a form of potential energy within chemical bonds.
D)  comes from the sun.
E)  is not important in physiological processes.F) A) and D)
G) A) and E)

Question 3

How does a buffer help a solution maintain pH?

Accepted Answer

A)   A buffer releases acid to maintain proper pH.
B)   A buffer forms both cations and anions to counteract acids.
C)   A buffer can act like a base if pH is acidic,and it can act like an acid if pH is basic.
D)   A buffer release base to neutralize acid.E) C) and D)
F) A) and C)

Question 4

Solubility refers to the ability of one substance to ___________ in another.

Accepted Answer

A)  react
B)  dissolve
C)  precipitate
D)  conduct
E)  None of these choices are correct.F) B) and D)
G) B) and E)

Question 5

-The sodium chloride molecule breaks apart in water.What does "D" represent?

Accepted Answer

A)  chloride ion
B)  dissociation
C)  water molecule
D)  sodium ion
E)  salt crystalF) A) and D)
G) A) and C)

Question 6

Electrolytes are substances that

Accepted Answer

A)  are NOT found in the human body in any appreciable amounts.
B)  form covalent bonds with water.
C)  cannot conduct electricity in solution.
D)  are NOT charged particles.
E)  conduct electricity when dissolved in water.F) B) and D)
G) All of the above

Question 7

Phospholipids

Accepted Answer

A)  are fat-soluble vitamins.
B)  are found in cell membranes.
C)  contain subunits called amino acids.
D)  are water-soluble.
E)  are a type of steroid.F) A) and D)
G) A) and C)

Question 8

Which of the following organic groups does lactose belong to?

Accepted Answer

A)  protein
B)  nucleic acid
C)  carbohydrate
D)  lipid
E)  vitaminF) None of the above
G) A) and E)

Question 9

DNA

Accepted Answer

A)  contains the sugar deoxyribose.
B)  assembles amino acids to make proteins..
C)  is one of several amino acids.
D)  must travel to ribosomes to function.
E)  is a single-stranded molecule.F) B) and D)
G) A) and C)

Question 10

Sodium chloride is considered a(n)

Accepted Answer

A)  molecule.
B)  element.
C)  compound.
D)  molecule and a compound.
E)  ion.F) B) and E)
G) A) and B)

Question 11

The amount of matter in an object is its

Accepted Answer

A)  size.
B)  weight.
C)  density.
D)  volume.
E)  mass.F) A) and B)
G) All of the above

Question 12

Carbon dioxide is considered a(n)

Accepted Answer

A)  compound.
B)  molecule.
C)  ion.
D)  element.
E)  molecule and a compound.F) B) and D)
G) B) and C)

Question 13

Which of the following would be classified as a lipid?

Accepted Answer

A)  catalase-an enzyme
B)  alanine-an amino acid
C)  starch-a polysaccharide
D)  cholesterol-a steroid
E)  sucrose-a disaccharideF) B) and D)
G) B) and E)

Question 14

Polysaccharides

Accepted Answer

A)  are the smallest carbohydrates.
B)  contain carbon,hydrogen,and phosphate atoms.
C)  are not found in plants.
D)  contain long chains of monosaccharides.
E)  are formed when sucrose and glucose combine.F) A) and E)
G) B) and E)

Question 15

Chemical substances that dissolve in water or react with water to release ions are known as

Accepted Answer

A)  buffers.
B)  electrolytes.
C)  bases.
D)  inorganic compounds.
E)  enzymes.F) B) and C)
G) C) and D)

Question 16

Intermolecular forces

Accepted Answer

A)  separate atoms and ions from one another.
B)  are electrostatic attractions between different molecules.
C)  are found within molecules.
D)  evenly distribute electrical charge among all atoms in a sample.
E)  form dissociated ions.F) B) and C)
G) A) and B)

Question 17

What particle is formed when an acid loses a proton (H+) ?

Accepted Answer

A)  conjugate base
B)  buffer
C)  conjugate acid
D)  saltE) C) and D)
F) A) and D)

Question 18

Cations and anions that dissociate in water are sometimes called

Accepted Answer

A)  molecules
B)  nonelectrolytes and solutes.
C)  electrolytes,because they can conduct an electrical current.
D)  nonelectrolytes,because they do not conduct an electrical current.
E)  molecules and electrolytes.F) B) and C)
G) A) and C)

Question 19

Which of the following is a synthesis reaction?

Accepted Answer

A)  Two amino acids are bonded together to form a dipeptide.
B)  Sodium chloride is dissolved in water.
C)  ATP is converted to ADP.
D)  Sucrose is chemically separated to form one molecule of glucose and one molecule of fructose.
E)  Several dipeptide chains are formed from digestion of a long polypeptide chain.F) A) and E)
G) A) and B)

Question 20

-The sodium chloride molecule breaks apart in water.What does "E" represent (the process) ?

Accepted Answer

A)  chloride ion
B)  dissociation
C)  water molecule
D)  sodium ion
E)  salt crystalF) A) and D)
G) A) and C)

Exam 2: The Chemical Basis of Life

Solubility refers to the ability of one substance to ___________ in another.

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Which of the following would be classified as a lipid?

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Polysaccharides

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Chemical energy

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Intermolecular forces

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What particle is formed when an acid loses a proton (H+) ?

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Electrolytes are substances that

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Carbon dioxide is considered a(n)

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The amount of matter in an object is its

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Cations and anions that dissociate in water are sometimes called

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-The sodium chloride molecule breaks apart in water.What does "D" represent?

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Chemical substances that dissolve in water or react with water to release ions are known as

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How does a buffer help a solution maintain pH?

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DNA

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Which of the following organic groups does lactose belong to?

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-The sodium chloride molecule breaks apart in water.What does "E" represent (the process) ?

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-Phospholipids are important components of the plasma membrane.What does "A" represent on the diagram?

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Which of the following is a synthesis reaction?

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Sodium chloride is considered a(n)

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Phospholipids

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