Question 1

All isotopes of a given element have the same atomic mass.

Accepted Answer

A) True 
 B)False

Question 2

Name and describe the four main categories of lipids, and compare and contrast their structures and functions.

Accepted Answer

Essays should descri...

Question 3

Within DNA, adenine makes hydrogen bonds with thymine, and guanine makes hydrogen bonds with cytosine.

Accepted Answer

A) True 
 B)False

Question 4

An atom with a positive or negative charge is known as a(n) ________.

Accepted Answer

The answer of An atom with a positive or negative...

Question 5

For every atom of carbon in a carbohydrate

Accepted Answer

A)   there is approximately one atom of hydrogen.
B)   there are approximately two atoms of hydrogen.
C)   there are approximately three atoms of hydrogen.
D)   there are approximately four atoms of hydrogen.E) B) and C)
F) A) and D)

Question 6

When a strong acid is placed in water, it

Accepted Answer

A)   does not dissolve or dissociate.
B)   dissolves but does not dissociate.
C)   dissolves and dissociates.
D)   dissociates, but does not dissolve.E) None of the above
F) C) and D)

Question 7

An atomic nucleus consists of protons and neutrons and is positively charged.

Accepted Answer

A) True 
 B)False

Question 8

When extreme temperature changes a protein's shape so much that it can no longer perform its usual function, that change is known as ________.

Accepted Answer

The answer of When extreme temperature changes a protein's shape...

Question 9

In the formation of an ionic bond between Na and Cl to form common table salt, sodium (Na)  ________ an electron and chlorine (Cl)  ________ an electron.

Accepted Answer

A)   loses; gains
B)   gains; loses
C)   loses; also loses
D)   gains; also gainsE) All of the above
F) B) and C)

Question 10

Starch and cellulose are examples of polysaccharides found in plants.

Accepted Answer

A) True 
 B)False

Question 11

In some proteins, disulfide covalent bonds form between two ________ amino acids.

Accepted Answer

The answer of In some proteins, disulfide covalent bonds form...

Question 12

ATP is a nucleotide that is composed of

Accepted Answer

A)   adenine, ribose, and three covalently bonded phosphate groups.
B)   adenine, thymine, and three covalently bonded phosphate groups.
C)   adipose, thymine, and three phosphate groups linked by ionic bonds.
D)   adenosine, deoxyribose, and three phosphorous atoms.
E)   arginine, thymidine and three phosphorous atoms.F) B) and C)
G) A) and B)

Question 13

A polymer is made up of several subunits called ________.

Accepted Answer

The answer of A polymer is made up of several...

Question 14

Bicarbonate (HCO3-)  is a

Accepted Answer

A)   strong proton donor.
B)   strong proton acceptor.
C)   weak proton donor.
D)   weak proton acceptor.E) A) and B)
F) B) and D)

Question 15

Generally, a chemical buffer is described as

Accepted Answer

A)   a strong acid or strong base that brings the pH of a solution to 7.0.
B)   a weak acid and weak base that help prevent big changes in pH.
C)   a neutral molecule that does not influence the pH in any way.
D)   a weak acid that makes a solution slightly more basic by its presence.E) All of the above
F) C) and D)

Question 16

Explain the mechanisms by which certain changes in environmental conditions can denature proteins.

Accepted Answer

High temperatures weaken the intramolecu...

Question 17

A protein consists of

Accepted Answer

A)   an amine group, a carboxyl group, and an R group.
B)   more than 200 amino acids.
C)   between 3 and 20 amino acids.
D)   a C-terminal, several nucleic acids, and an N-terminal.E) None of the above
F) B) and D)

Question 18

When atoms of elements on the left side of the periodic table ionize, they tend to

Accepted Answer

A)   gain electrons and therefore become anions.
B)   gain protons and therefore become anions.
C)   lose electrons and therefore become cations.
D)   lose protons and therefore become cations.
E)   add neutrons and therefore become megaions.F) A) and D)
G) B) and D)

Question 19

In the formation of a compound of sodium chloride,

Accepted Answer

A)   a chlorine atom donates an electron to a sodium atom.
B)   a chloride ion donates two protons to a sodium ion.
C)   a sodium atom donates an electron to a chlorine atom.
D)   a sodium ion donates two electrons to a chlorine atom.
E)   the sodium and chlorine atoms share a pair of electrons equally.F) B) and C)
G) B) and E)

Question 20

Within the periodic table, elements are organized consecutively by

Accepted Answer

A)   atomic mass within columns.
B)   atomic mass within rows.
C)   atomic number within columns.
D)   atomic number within rows.E) A) and B)
F) None of the above

Exam 2: Atoms, Ions, and Molecules

Within the periodic table, elements are organized consecutively by

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Within DNA, adenine makes hydrogen bonds with thymine, and guanine makes hydrogen bonds with cytosine.

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Starch and cellulose are examples of polysaccharides found in plants.

Correct AnswerverifiedShow Answer

An atom with a positive or negative charge is known as a(n) ________.

Correct AnswerverifiedShow Answer

When a strong acid is placed in water, it

Correct AnswerverifiedShow Answer

Generally, a chemical buffer is described as

Correct AnswerverifiedShow Answer

Explain the mechanisms by which certain changes in environmental conditions can denature proteins.

Correct AnswerverifiedHigh temperatures weaken the intramolecu...View AnswerShow Answer

An atomic nucleus consists of protons and neutrons and is positively charged.

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Bicarbonate (HCO3-) is a

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ATP is a nucleotide that is composed of

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When atoms of elements on the left side of the periodic table ionize, they tend to

Correct AnswerverifiedShow Answer

For every atom of carbon in a carbohydrate

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In some proteins, disulfide covalent bonds form between two ________ amino acids.

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In the formation of a compound of sodium chloride,

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When extreme temperature changes a protein's shape so much that it can no longer perform its usual function, that change is known as ________.

Correct AnswerverifiedShow Answer

In the formation of an ionic bond between Na and Cl to form common table salt, sodium (Na) ________ an electron and chlorine (Cl) ________ an electron.

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A polymer is made up of several subunits called ________.

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Name and describe the four main categories of lipids, and compare and contrast their structures and functions.

Correct AnswerverifiedEssays should descri...View AnswerShow Answer

A protein consists of

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All isotopes of a given element have the same atomic mass.

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High temperatures weaken the intramolecu...
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Bicarbonate (HCO₃^-) is a

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In the formation of an ionic bond between Na and Cl to form common table salt, sodium (Na) an electron and chlorine (Cl) an electron.

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Essays should descri...
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