Question 1

Radioisotopes are useful in scientific research and medicine because they

Accepted Answer

A)   have a different number of protons than other isotopes of the same element.
B)   give off high-energy radiation that can be detected by film and specialized scanning machines.
C)   have the same atomic mass as other isotopes of the same element.
D)   have a different number of electrons than other isotopes of the same element.E) All of the above
F) B) and D)

Question 2

The following figure shows the chemical structure and space-filling models for stearic acid and oleic acid.
  
The reason oleic acid is slightly bent (as compared to stearic acid)is that it contains a ________ between two of its carbon atoms.

Accepted Answer

double bond

Question 3

A solution with a pH of ________ is ________ times more acidic than a solution with a pH of ________.

Accepted Answer

A)   3;10,000;7
B)   12;100;10
C)   7;1,000;9
D)   4;10;3E) A) and B)
F) None of the above

Question 4

The atoms in water molecules are held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 5

Examine the following illustration,a representation of a sodium ion with a charge of +1.Based on the information provided,determine the proton number for this atom.

Accepted Answer

A)   8
B)   9
C)   10
D)   11E) None of the above
F) B) and C)

Question 6

How many atoms are present in a single molecule of C8H10N4O2?

Accepted Answer

A)   4
B)   8
C)   12
D)   24E) A) and B)
F) All of the above

Question 7

The types of proteins that speed up the rate of chemical reactions in the cell are called ________.

Accepted Answer

The answer of The types of proteins that speed up...

Question 8

Molecules with an uneven distribution of charge are described as ________.

Accepted Answer

The answer of Molecules with an uneven distribution of charge...

Question 9

Nucleotides

Accepted Answer

A)   are the building blocks of proteins.
B)   are involved in every chemical reaction in the cell.
C)   form physical structures such as hair.
D)   are the building blocks of nucleic acids.E) C) and D)
F) A) and D) D

Question 10

The most abundant protein found in animals is actinomyosin.

Accepted Answer

A) True 
 B)False

Question 11

A group of monomers bonded together form a ________.

Accepted Answer

The answer of A group of monomers bonded together form...

Question 12

Both trans fats and saturated fats have been linked to comparable groups of undesirable health complications.What do the two types of molecules share in common that may account for the similarity in their health impacts?

Accepted Answer

A)   Both molecules form solid assemblies at body temperature and clog small blood vessels.
B)   Both molecules are rich in hydrogen that can easily form hydrogen ions and lower the pH to harmful values.
C)   Both molecules are linear;for reasons not currently understood,linear fatty acids appear to be more difficult to metabolize and have high biological activities.
D)   Both molecules are rapidly converted to signal molecules called prostaglandins,creating discordant signaling within the body.E) C) and D)
F) None of the above

Question 13

Which of the following is NOT a function of cholesterol?

Accepted Answer

A)   Cholesterol is converted into other important molecules like steroid hormones.
B)   Cholesterol is converted into a vitamin important in the growth and maintenance of bone and muscle.
C)   Cholesterol is a necessary component in the cell membranes of plants.
D)   A derivative of cholesterol aids in the digestion of fats.E) A) and D)
F) B) and C)

Question 14

All the isotopes of a particular element have the same number of protons.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following combinations of atoms would form ionic bonds?

Accepted Answer

A)   H+ and O
B)   Na+ and K+
C)   Na+ and Cl+
D)   PO41-and I2-E) B) and D)
F) C) and D)

Question 16

Because both the wood in a tree branch and the spider's exoskeleton are composed of low-density cellulose,each floats when placed in water.

Accepted Answer

A) True 
 B)False  False

Question 17

Lipids with a four-ring structure are called ________.

Accepted Answer

The answer of Lipids with a four-ring structure are called...

Question 18

In the equation 3H2 + N2  →\rarr→  2NH3,how many molecules of hydrogen gas (H2) are present?

Accepted Answer

A)   2
B)   3
C)   6
D)   12 E) None of the above
F) A) and C)

Question 19

The chemical reaction that represents the combustion of glucose is C6H12O6 + O2  →\rarr→ 
CO2 + H2O + E;the reactants are

Accepted Answer

A)   CO2 and H2O.
B)   O2 and H2O.
C)   C6H12O6 and O2.
D)   C6H12O6 and CO2. E) A) and B)
F) None of the above

Question 20

O2,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

Accepted Answer

A)   It contains no covalent bonds.
B)   It contains a double covalent bond but not a single covalent bond.
C)   To be considered a compound,there must be a minimum of three atoms;atmospheric oxygen is too small.
D)   Compounds are defined as molecules constructed from two or more different elements.E) B) and D)
F) A) and C)

Exam 2: The Chemistry of Life

Radioisotopes are useful in scientific research and medicine because they

Correct AnswerverifiedShow Answer

The following figure shows the chemical structure and space-filling models for stearic acid and oleic acid. The reason oleic acid is slightly bent (as compared to stearic acid)is that it contains a ________ between two of its carbon atoms.

Correct Answerverifieddouble bond

A solution with a pH of ________ is ________ times more acidic than a solution with a pH of ________.

Correct AnswerverifiedShow Answer

The atoms in water molecules are held together by hydrogen bonds.

Correct AnswerverifiedShow Answer

Examine the following illustration,a representation of a sodium ion with a charge of +1.Based on the information provided,determine the proton number for this atom.

Correct AnswerverifiedShow Answer

How many atoms are present in a single molecule of C8H10N4O2?

Correct AnswerverifiedShow Answer

The types of proteins that speed up the rate of chemical reactions in the cell are called ________.

Correct AnswerverifiedShow Answer

Molecules with an uneven distribution of charge are described as ________.

Correct AnswerverifiedShow Answer

Nucleotides

Correct AnswerverifiedD

The most abundant protein found in animals is actinomyosin.

Correct AnswerverifiedShow Answer

A group of monomers bonded together form a ________.

Correct AnswerverifiedShow Answer

Both trans fats and saturated fats have been linked to comparable groups of undesirable health complications.What do the two types of molecules share in common that may account for the similarity in their health impacts?

Correct AnswerverifiedShow Answer

Which of the following is NOT a function of cholesterol?

Correct AnswerverifiedShow Answer

All the isotopes of a particular element have the same number of protons.

Correct AnswerverifiedShow Answer

Which of the following combinations of atoms would form ionic bonds?

Correct AnswerverifiedShow Answer

Because both the wood in a tree branch and the spider's exoskeleton are composed of low-density cellulose,each floats when placed in water.

Correct AnswerverifiedFalse

Lipids with a four-ring structure are called ________.

Correct AnswerverifiedShow Answer

In the equation 3H2 + N2 →\rarr→ 2NH3,how many molecules of hydrogen gas (H2) are present?

Correct AnswerverifiedShow Answer

The chemical reaction that represents the combustion of glucose is C6H12O6 + O2 →\rarr→ CO2 + H2O + E;the reactants are

Correct AnswerverifiedShow Answer

O2,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

Correct AnswerverifiedShow Answer

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double bond

A solution with a pH of is times more acidic than a solution with a pH of .

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How many atoms are present in a single molecule of C₈H₁₀N₄O₂?

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D

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False

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In the equation 3H₂ + N₂ $\rarr$ 2NH₃,how many molecules of hydrogen gas (H₂) are present?

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The chemical reaction that represents the combustion of glucose is C₆H₁₂O₆ + O₂ $\rarr$ CO₂ + H₂O + E;the reactants are

Correct Answer
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O₂,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

Correct Answer
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