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Multiple Choice Quiz
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1

The amount of matter in an object is referred to as its
A)weight.
B)mass.
C)atomic number.
D)atomic mass.
2

Which of the following does not contribute to the majority of an animal's weight?
A)oxygen
B)carbon
C)hydrogen
D)sodium
3

The atomic mass of an element is equal to the number of __________ and _________ in the nucleus of one of its atoms.
A)neutrons and protons
B)protons and electrons
C)electrons and neutrons
D)isotopes and neutrons
4

The atomic number of an element is the number of __________ in its nucleus.
A)neutrons
B)electrons
C)protons
D)isotopes
5

If a substance can be broken down into two or more chemical elements, it is a
A)mixture.
B)solution.
C)element.
D)compound.
6

Which of the following is not a type of chemical bond?
A)ionic
B)hydrogen
C)covalent
D)hydrophobic
7

When elements share outer-shell electrons with other atoms, the chemical bond that forms is a
A)ionic bond.
B)hydrogen bond.
C)covalent bond.
D)elemental bond.
8

__________ bonds form when an atom or group of atoms develops an electrical charge and attracts an atom or group of atoms with an opposite charge.
A)Ionic
B)Hydrogen
C)Covalent
D)Nonpolar covalent
9

Which of the following is an electrolyte?
A)water
B)NaCl
C)glucose
D)ethane
10

Distilled water has a pH of
A)5.
B)6.
C)7.
D)8.
11

Which of the following is not a definition of pH?
A)pH = - log [H+]
B)pH = log([1/H+])
C)A measure of the hydrogen ion concentration
D)A measure of the hydroxyl ion concentration
12

The key element in all organic molecules is
A)oxygen.
B)hydrogen.
C)nitrogen.
D)carbon.
13

Substances that resist a change in pH are called
A)electrolytes.
B)bases.
C)buffers.
D)acids.
14

The major source of energy in animals comes from
A)fats.
B)nucleic acids.
C)proteins.
D)carbohydrates.
15

Two monosaccharides can combine to form a
A)isomer.
B)polysaccharide.
C)disaccharide.
D)hydrogen bond.
16

Chitin is a good example of a
A)polysaccharide.
B)carbohydrate.
C)polymer.
D)all of these (a-c).
17

Glycogen can be considered to be a
A)polysaccharide.
B)carbohydrate.
C)polymer.
D)all of these (a-c).
18

Fats are lipid soluble molecules.
A)True
B)False
19

The individual building blocks of proteins are called amino acids.
A)True
B)False
20

When two amino acids bond, they form a tripeptide.
A)True
B)False
21

A protein's linear sequence of amino acids is its secondary structure.
A)True
B)False
22

Nucleotides are made up of nucleic acid subunits.
A)True
B)False
23

NAD+ and FAD are nucleotide coenzymes.
A)True
B)False
24

Testosterone and cholesterol are good examples of steroids.
A)True
B)False
25

The three-dimensional arrangement of more than one polypeptide gives some proteins their quaternary structure.
A)True
B)False





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