Question 1

All enzymes are __________.

Accepted Answer

A)   cofactors
B)   proteins
C)   lipids
D)   carbohydrates
E)   nucleic acidsF) B) and C)
G) A) and E)

Question 2

Which of the following is a disaccharide?

Accepted Answer

A)   Galactose
B)   Lactose
C)   Glucose
D)   Fructose
E)   AmyloseF) C) and E)
G) A) and E)

Question 3

Minerals are organic elements extracted from the soil by plants.

Accepted Answer

A) True 
 B)False

Question 4

Hydrogen,deuterium,and tritium are three isotopes of hydrogen.

Accepted Answer

A) True 
 B)False

Question 5

Na (atomic no.11) reacts with Cl (atomic no.17) to become stable.In the reaction,Na will ____________,while Cl will ____________.

Accepted Answer

A)   accept one electron;give up one electron
B)   give up one proton;accept one proton
C)   share one electron with chlorine;share one electron with sodium
D)   become an anion;become a cation
E)   give up one electron;accept one electronF) A) and B)
G) A) and E)

Question 6

All amino acids have both a carboxyl group and an amino group attached to a central carbon.

Accepted Answer

A) True 
 B)False

Question 7

Which of these is hydrophobic?

Accepted Answer

A)   Glucose
B)   K+
C)   Cl-
D)   Water
E)   FatF) None of the above
G) A) and B)

Question 8

__________ is a monosaccharide,whereas __________ is a polysaccharide.

Accepted Answer

A)   Fructose;sucrose
B)   Galactose;maltose
C)   Lactose;glycogen
D)   Glucose;starch
E)   Cellulose;glucoseF) D) and E)
G) B) and C)

Question 9

The formula of an amino group is __________;the formula of a carboxyl group is __________.

Accepted Answer

A)   -COOH;-OH
B)   -CH3;-NH2
C)   -OH;-SH
D)   -NH2;-COOH
E)   -SH;-H2PO4F) B) and E)
G) A) and D)

Question 10

Ionic bonds break apart in water more easily than covalent bonds do.

Accepted Answer

A) True 
 B)False

Question 11

The most relevant free energy in human physiology is the energy stored in __________.

Accepted Answer

A)   electrolytes ionized in water
B)   free radicals with an odd number of electrons
C)   radioisotopes
D)   the chemical bonds of organic molecules
E)   Van der Waals forcesF) B) and E)
G) B) and D)

Question 12

A solution that resists a change in pH when an acid or base is added to it is a(n) __________.

Accepted Answer

A)   buffer
B)   catalyst
C)   reducing agent
D)   oxidizing agent
E)   colloidF) B) and D)
G) A) and D)

Question 13

In a workout your muscle cells produce lactate,yet you maintain a constant blood pH because _________.

Accepted Answer

A)   metabolic acids are neutralized in muscle cells before released into the blood
B)   metabolic bases are produced at the same rate by muscle cells to neutralize the acids
C)   the respiratory system removes excess H+ from the blood before the pH is lowered
D)   the body contains chemicals called buffers that resist changes in pH
E)   endothelial cells secrete excess H+ to prevent a decrease in pHF) A) and C)
G) B) and D)

Question 14

The opposite of a dehydration synthesis reaction is a hydrolysis reaction.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is not a nucleotide?

Accepted Answer

A)   RNA
B)   GTP
C)   ATP
D)   cAMPE) A) and C)
F) B) and C)

Question 16

Potential energy stored in bonds is released as __________ energy.

Accepted Answer

A)   electromagnetic
B)   electrical
C)   chemical
D)   heat
E)   kineticF) A) and B)
G) A) and C)

Question 17

Proteoglycans are composed of __________.

Accepted Answer

A)   carbohydrates and fats
B)   nucleic acids and fats
C)   carbohydrates and proteins
D)   proteins and fats
E)   nucleic acids and proteinsF) B) and C)
G) None of the above

Question 18

Nucleic acids are __________ of __________.

Accepted Answer

A)   monomers;monosaccharides
B)   monomers;ATP
C)   polymers;nucleotides
D)   polymers;cAMP
E)   polymers;DNAF) C) and E)
G) None of the above

Question 19

The concentration of a solution may be expressed by all of the following except _________.

Accepted Answer

A)   weight per volume
B)   percentage
C)   molarity
D)   pHE) A) and B)
F) A) and C)

Question 20

__________ account for 98.5% of the body's weight.

Accepted Answer

A)   Carbon,oxygen,hydrogen,sodium,potassium,and chlorine
B)   Carbon,oxygen,iron,sodium,potassium,and chlorine
C)   Carbon,nitrogen,hydrogen,sodium,potassium,and chlorine
D)   Carbon,oxygen,hydrogen,nitrogen,sodium,and potassium
E)   Carbon,oxygen,hydrogen,nitrogen,calcium,and phosphorusF) A) and D)
G) All of the above

Exam 2: The Chemistry of Life

Which of these is hydrophobic?

Correct AnswerverifiedShow Answer

All enzymes are __________.

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Ionic bonds break apart in water more easily than covalent bonds do.

Correct AnswerverifiedShow Answer

In a workout your muscle cells produce lactate,yet you maintain a constant blood pH because _________.

Correct AnswerverifiedShow Answer

Proteoglycans are composed of __________.

Correct AnswerverifiedShow Answer

A solution that resists a change in pH when an acid or base is added to it is a(n) __________.

Correct AnswerverifiedShow Answer

Which of the following is not a nucleotide?

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All amino acids have both a carboxyl group and an amino group attached to a central carbon.

Correct AnswerverifiedShow Answer

Potential energy stored in bonds is released as __________ energy.

Correct AnswerverifiedShow Answer

Hydrogen,deuterium,and tritium are three isotopes of hydrogen.

Correct AnswerverifiedShow Answer

__________ account for 98.5% of the body's weight.

Correct AnswerverifiedShow Answer

Na (atomic no.11) reacts with Cl (atomic no.17) to become stable.In the reaction,Na will ____________,while Cl will ____________.

Correct AnswerverifiedShow Answer

Minerals are organic elements extracted from the soil by plants.

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The concentration of a solution may be expressed by all of the following except _________.

Correct AnswerverifiedShow Answer

The formula of an amino group is __________;the formula of a carboxyl group is __________.

Correct AnswerverifiedShow Answer

Nucleic acids are __________ of __________.

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The opposite of a dehydration synthesis reaction is a hydrolysis reaction.

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__________ is a monosaccharide,whereas __________ is a polysaccharide.

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Which of the following is a disaccharide?

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The most relevant free energy in human physiology is the energy stored in __________.

Correct AnswerverifiedShow Answer

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Na (atomic no.11) reacts with Cl (atomic no.17) to become stable.In the reaction,Na will ,while Cl will .

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The formula of an amino group is ;the formula of a carboxyl group is .

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Nucleic acids are of .

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is a monosaccharide,whereas is a polysaccharide.

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