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Multiple Choice Quiz
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1
A substance that cannot be broken down into a simpler substance by chemical means is a/an
A)element.
B)compound.
C)molecule.
D)nucleic acid.
2
The positively charged particles located in the nucleus of an atom are the
A)electrons.
B)protons.
C)neutrons.
D)nucleons.
3
The number of protons plus the number of neutrons determines the __________ of an atom.
A)isotope
B)valence electrons
C)atomic number
D)atomic weight
4
Two or more atoms combine chemically to form a/an __________, the smallest unit of a/an __________.
A)molecule; isotope
B)molecule; element
C)molecule; compound
D)element; compound
5
When one atom donates an electron to another atom, the donating atom becomes a __________ charged ion, and the receiving atom becomes a __________ charged ion. These ions are joined together by a/an ________ chemical bond.
A)positively; negatively; ionic
B)negatively; positively; ionic
C)negatively; positively; covalent
D)positively; negatively; hydrogen
6
The element that forms the backbone of organic molecules is
A)hydrogen.
B)oxygen.
C)carbon.
D)nitrogen.
7
Which of the following is the organic compound?
A)NaHCO3
B)NaOH
C)C6H12O6
D)CO2
8
The dissociation of a/an ________ releases hydrogen ions and increases the concentration of hydrogen ions in a solution.
A)acid
B)base
C)salt
D)solvent
9
The concentration of hydrogen ions in a solution increases from pH _______ to pH ________.
A)0; 14
B)7; 14
C)14; 0
D)0; 7
10
A carbohydrate molecule consisting of glucose + fructose is a
A)monosaccharide.
B)disaccharide.
C)polysaccharide.
D)starch.
11
The monosaccharide that is the major carbohydrate fuel for body cells is
A)sucrose.
B)fructose.
C)galactose.
D)glucose.
12
Select the organic compound in which the greatest amount of excess energy is stored in the body.
A)Glycogen
B)Glucose
C)Triglycerides
D)Cholesterol
13
Proteins are composed of subunits called __________ and functional proteins include _________, which speed up chemical reactions in the body.
A)amino acids; enzymes
B)fatty acids; enzymes
C)fatty acids; triglycerides
D)amino acids; antibodies
14
Select the correct statement.
A)DNA and RNA are double-stranded molecules composed of nucleotides.
B)DNA and RNA are single-stranded molecules with dissimilar nucleotides.
C)DNA contains the genetic code, and RNA carries the coded information to the sites of protein synthesis.
D)DNA is double-stranded but RNA is single-stranded, although their nucleotides are identical.
15
The molecule that provides immediate energy for cellular processes is
A)glucose.
B)glycogen.
C)starch.
D)adenosine triphosphate.





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