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1 | |
Protein accounts for the greatest percentage of the body's total weight. (p. 24) |
| | A) | True |
| | B) | False |
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2 | |
A chemical bond between two atoms consists of shared electrons. (p. 24) |
| | A) | True |
| | B) | False |
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3 | |
The atomic mass of an atom is the sum of the number of its protons and electrons. (p. 24) |
| | A) | True |
| | B) | False |
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4 | |
The atomic number of an atom is equal to the number of protons it has. (p. 24) |
| | A) | True |
| | B) | False |
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5 | |
A full electron orbital always contains eight electrons. (p. 24) |
| | A) | True |
| | B) | False |
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6 | |
Different isotopes of each other are considered to be the same chemical element. (p. 24) |
| | A) | True |
| | B) | False |
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7 | |
A covalent bond is one in which two atoms equally share one pair of electrons. (p. 25) |
| | A) | True |
| | B) | False |
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8 | |
Water is able to dissolve more substances than any other solvent because the molecules of water are nonpolar. (p. 25) |
| | A) | True |
| | B) | False |
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9 | |
A chlorine atom has seven electrons in its outermost shell (orbital) and becomes a chloride ion when it receives an electron from some other atom and completes this shell. (p. 27) |
| | A) | True |
| | B) | False |
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10 | |
Sodium chloride comes apart readily in water because it is so hydrophobic. (p. 27) |
| | A) | True |
| | B) | False |
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11 | |
Water would not have any surface tension if water could not form hydrogen bonds. (p. 27) |
| | A) | True |
| | B) | False |
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12 | |
When two elements form an ionic bond, they do not share any electrons. (p.26) |
| | A) | True |
| | B) | False |
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13 | |
Anions are negatively charged and will move toward the positive pole, or cathode, in an electric field. (p. 26) |
| | A) | True |
| | B) | False |
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14 | |
Ionic bonds are formed when an anion shares a pair of electrons with a cation. (p. 26) |
| | A) | True |
| | B) | False |
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15 | |
Ionic bonds are weaker than covalent bonds. (p. 27) |
| | A) | True |
| | B) | False |
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16 | |
Electronegative atoms are those that exert an attractive force on nearby electrons. (p. 27) |
| | A) | True |
| | B) | False |
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17 | |
The hydrogen ions released from acids combine with water molecules to form H3O+ (hydronium) ions. (p. 28) |
| | A) | True |
| | B) | False |
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18 | |
When a solution has a pH of 7.0, its hydrogen ion concentration is 7 molar. (p.28) |
| | A) | True |
| | B) | False |
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19 | |
It is not logically possible to have a pH of 20. (p. 29) |
| | A) | True |
| | B) | False |
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20 | |
A solution with pH 7 has a thousand times the hydrogen ion concentration of one with pH 10. (p. 29) |
| | A) | True |
| | B) | False |
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21 | |
Organic molecules are composed entirely of carbon, hydrogen, and oxygen. (p. 29) |
| | A) | True |
| | B) | False |
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22 | |
Any two atoms can only share one pair of electrons when they form a covalent bond. (p. 29) |
| | A) | True |
| | B) | False |
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23 | |
Organic molecules with six-carbon rings and alternating double bonds are called aromatic compounds. (p. 29) |
| | A) | True |
| | B) | False |
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24 | |
Benzene is a six-sided ring of carbon atoms with one hydrogen atom attached to each and with alternate double covalent bonds between the carbon atoms. (p. 29) |
| | A) | True |
| | B) | False |
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25 | |
Stereoisomers of each other react the same way chemically, because they have the same atoms in the same atoms in the same sequence. (p. 29) |
| | A) | True |
| | B) | False |
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26 | |
Since stereoisomers have the same atoms in the same sequence, two stereoisomers of the same compound have the same biological effects. (p. 31) |
| | A) | True |
| | B) | False |
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27 | |
The digestive breakdown of starch to simple sugars is an example of hydrolysis. (p. 32) |
| | A) | True |
| | B) | False |
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28 | |
Of all the lipids, only fatty acids are freely soluble in water, due to their free carboxyl groups. (p.34) |
| | A) | True |
| | B) | False |
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29 | |
An unsaturated fat has numerous C=C double covalent bonds in its structure. (p. 35) |
| | A) | True |
| | B) | False |
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30 | |
Triglycerides are described as neutral fats because they cannot release free H+ ion. (p. 35) |
| | A) | True |
| | B) | False |
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31 | |
Uncontrolled diabetes mellitus can lead to an excessive concentration of ketones in the blood.(p. 35) |
| | A) | True |
| | B) | False |
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32 | |
Phospholipids could not form micelles if it were not for that fact that they have both hydrophobic and hydrophilic components in their structure. (p. 36) |
| | A) | True |
| | B) | False |
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33 | |
Prostaglandins get their name from the fact that they are produced only by the prostate gland of the male. (p. 37) |
| | A) | True |
| | B) | False |
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34 | |
A molecule is classified as either hydrophilic or hydrophobic because it either mixes with water or it does not. It cannot be both. (p. 36) |
| | A) | True |
| | B) | False |
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35 | |
A protein is considered to be a polypeptide. (p. 38) |
| | A) | True |
| | B) | False |
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36 | |
The precise structure of a protein is determined by a different class of organic compounds, namely the nucleic acids. (p. 38) |
| | A) | True |
| | B) | False |
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37 | |
The primary structure of a protein is determined by its peptide bonds. (p. 39) |
| | A) | True |
| | B) | False |
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38 | |
Not all proteins have a quaternary structure. (p. 41) |
| | A) | True |
| | B) | False |
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39 | |
A disulfide bond is stronger than an ionic bond. (p. 41) |
| | A) | True |
| | B) | False |
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40 | |
Tendons and ligaments get their strength from a protein called collagen. (p. 42) |
| | A) | True |
| | B) | False |
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2002 McGraw-Hill Higher Education