Question 1

The molecular formula of chlorine gas is Cl2. One molecule of this gas would be attracted to another by

Accepted Answer

A)   polar covalent bonds.
B)   intermolecular forces between nonpolar molecules.
C)   ionic bonds.
D)   hydrogen bonds.
E)   intramolecular forces.F) A) and E)
G) A) and D)

Question 2

Given a watery solution in which 1/1,000,000 particles are free H+ ions, what will the pH be?

Accepted Answer

A)   2
B)   5
C)   6
D)   7
E)   10F) B) and E)
G) A) and D)

Question 3

When biological molecules engage in condensation, such reactions are ________ reactions.

Accepted Answer

A)   synthesis
B)   hydrolysis
C)   catabolic
D)   amphipathic
E)   ergonomicF) B) and D)
G) A) and C)

Question 4

Adenine and thymine are examples of double-ring nitrogenous bases called pyrimidines.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is a list of three types of lipids?

Accepted Answer

A)   Riboses, purines, and pyrimidines
B)   Eicosanoids, steroids, and triglycerides
C)   Fatty acids, proteins, and nucleotides
D)   Glucose, starch, and triglycerides
E)   Steroids, peptides, and sugarsF) All of the above
G) A) and B)

Question 6

When a large biological molecule is digested by the addition of water, the reaction is termed ________.

Accepted Answer

The answer of When a large biological molecule is digested...

Question 7

Describe the ionic form of calcium (what is its charge?). Then describe how three physiological systems would malfunction if calcium levels were not maintained homeostatically.

Accepted Answer

Calcium is a divalent cation. ...

Question 8

Isomers of the same molecule have identical chemical properties.

Accepted Answer

A) True 
 B)False

Question 9

Consider an atom with four electrons in its outer shell. If that atom is covalently bound to three other atoms within a molecule, then it is

Accepted Answer

A)   in a double bond with one atom and in single bonds with two atoms.
B)   in a single bond with one atom and in double bonds with two atoms.
C)   in a triple bond with one atom and in single bonds with two atoms.
D)   in double bonds with all three atoms.
E)   in single bonds with all three atoms.F) D) and E)
G) A) and B)

Question 10

A double covalent bond involves

Accepted Answer

A)   the sharing of one pair of electrons.
B)   the sharing of two pairs of electrons.
C)   the donation of one pair of electrons.
D)   the donation of two pairs of electrons.E) A) and B)
F) A) and C)

Question 11

Sodium bicarbonate (NaHCO3) is considered an ionic compound.

Accepted Answer

A) True 
 B)False

Question 12

Amino acids such as alanine contain hydrocarbons as side groups, and these amino acids engage in hydrophobic interactions with each other. Such amino acids are

Accepted Answer

A)   charged.
B)   hydrostatic.
C)   polar.
D)   nonpolar.
E)   polyunsaturated.F) All of the above
G) C) and D)

Question 13

"Hydrophobic exclusion" refers to the chemical interactions that prevent nonpolar molecules from dissolving in water.

Accepted Answer

A) True 
 B)False

Question 14

The first amino acid put in place when a protein is being synthesized at a ribosome is

Accepted Answer

A)   glycine.
B)   tryptophan.
C)   methionine.
D)   cysteine.
E)   proline.F) B) and C)
G) A) and E)

Question 15

MgCl2 fully dissociates into Mg2+ and Cl- ions when mixed with water. Therefore, the bonds between Mg2+ and Cl- in MgCl2 can be described as

Accepted Answer

A)   ionic.
B)   polar covalent.
C)   nonpolar covalent.
D)   hydrogen bonds.E) All of the above
F) A) and D)

Question 16

Which of the following statements accurately describes electrons?

Accepted Answer

A)   They are found inside the nucleus and have a positive charge.
B)   They are in orbitals outside the nucleus and have a positive charge.
C)   They are found inside the nucleus and have a negative charge.
D)   They are in orbitals outside the nucleus and have a negative charge.E) A) and D)
F) A) and C)

Question 17

Ions with a negative charge are called ________.

Accepted Answer

The answer of Ions with a negative charge are called...

Question 18

A technician is asked to make up a solution of physiological saline and is told that it should be a 0.9% NaCl solution using the mass/volume percent measurement of concentration. If the technician is making 100 milliliters of solution, how much NaCl should be included?

Accepted Answer

A)   9 micrograms
B)   9 kilograms
C)   9 grams
D)   0.9 grams
E)   90 gramsF) B) and C)
G) B) and D)

Question 19

The hydrogen bonds in a sample of water result in ________ cohesion and a ________ heat of vaporization.

Accepted Answer

A)   increased; high
B)   increased; low
C)   decreased; high
D)   decreased; lowE) B) and D)
F) A) and D)

Question 20

Given that the mass of an oxygen atom is 16 amu and that of a hydrogen atom is 1 amu, 1 mole of water would be equal to

Accepted Answer

A)   17 amu.
B)   18 amu.
C)   15 grams.
D)   18 grams.
E)   6.02 × 1023 grams.F) C) and D)
G) A) and C)

Exam 2: Atoms, Ions, and Molecules

When biological molecules engage in condensation, such reactions are ________ reactions.

Correct AnswerverifiedShow Answer

When a large biological molecule is digested by the addition of water, the reaction is termed ________.

Correct AnswerverifiedShow Answer

Sodium bicarbonate (NaHCO3) is considered an ionic compound.

Correct AnswerverifiedShow Answer

Amino acids such as alanine contain hydrocarbons as side groups, and these amino acids engage in hydrophobic interactions with each other. Such amino acids are

Correct AnswerverifiedShow Answer

Which of the following is a list of three types of lipids?

Correct AnswerverifiedShow Answer

Given that the mass of an oxygen atom is 16 amu and that of a hydrogen atom is 1 amu, 1 mole of water would be equal to

Correct AnswerverifiedShow Answer

Isomers of the same molecule have identical chemical properties.

Correct AnswerverifiedShow Answer

Given a watery solution in which 1/1,000,000 particles are free H+ ions, what will the pH be?

Correct AnswerverifiedShow Answer

The molecular formula of chlorine gas is Cl2. One molecule of this gas would be attracted to another by

Correct AnswerverifiedShow Answer

Describe the ionic form of calcium (what is its charge?). Then describe how three physiological systems would malfunction if calcium levels were not maintained homeostatically.

Correct AnswerverifiedCalcium is a divalent cation. ...View AnswerShow Answer

Adenine and thymine are examples of double-ring nitrogenous bases called pyrimidines.

Correct AnswerverifiedShow Answer

Which of the following statements accurately describes electrons?

Correct AnswerverifiedShow Answer

The hydrogen bonds in a sample of water result in ________ cohesion and a ________ heat of vaporization.

Correct AnswerverifiedShow Answer

MgCl2 fully dissociates into Mg2+ and Cl- ions when mixed with water. Therefore, the bonds between Mg2+ and Cl- in MgCl2 can be described as

Correct AnswerverifiedShow Answer

Ions with a negative charge are called ________.

Correct AnswerverifiedShow Answer

A technician is asked to make up a solution of physiological saline and is told that it should be a 0.9% NaCl solution using the mass/volume percent measurement of concentration. If the technician is making 100 milliliters of solution, how much NaCl should be included?

Correct AnswerverifiedShow Answer

Consider an atom with four electrons in its outer shell. If that atom is covalently bound to three other atoms within a molecule, then it is

Correct AnswerverifiedShow Answer

"Hydrophobic exclusion" refers to the chemical interactions that prevent nonpolar molecules from dissolving in water.

Correct AnswerverifiedShow Answer

A double covalent bond involves

Correct AnswerverifiedShow Answer

The first amino acid put in place when a protein is being synthesized at a ribosome is

Correct AnswerverifiedShow Answer

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Sodium bicarbonate (NaHCO₃) is considered an ionic compound.

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Given a watery solution in which 1/1,000,000 particles are free H⁺ ions, what will the pH be?

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The molecular formula of chlorine gas is Cl₂. One molecule of this gas would be attracted to another by

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Calcium is a divalent cation. ...
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The hydrogen bonds in a sample of water result in cohesion and a heat of vaporization.

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MgCl₂ fully dissociates into Mg²⁺ and Cl^- ions when mixed with water. Therefore, the bonds between Mg²⁺ and Cl^- in MgCl₂ can be described as

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