Chapter 6:
The Chemistry of Life
Practice Test
1.
A sulfur atom has 16 electrons. How many protons does this atom have?
a.
32
b.
16
c.
24
d.
8
Hint
2.
When two carbon atoms form a single bond, _________.
a.
each atom shares two electrons with the other atom
b.
they share one electron each and form a covalent bond
c.
one donates an electron to the other
d.
they both lose electrons to the surrounding atoms
Hint
3.
Which of the following best defines diffusion?
a.
the highest energy level in a particle
b.
the random movements of particles
c.
the kinetic energy of motion of particles in an atom
d.
net movement of particles from high to low concentration
Hint
4.
The total number of atoms in the molecule glucose, C
6
H
12
O
6
is __________.
a.
12
b.
48
c.
6
d.
24
Hint
5.
A saturated lipid contains __________.
a.
ionic bonds
b.
fewer hydrogen atoms than an unsaturated bond
c.
no double or triple bonds in the fatty acid chains
d.
more oxygen atoms than hydrogen atoms
Hint
6.
A base _________.
a.
combines with water to form an acid
b.
measures below pH 7
c.
forms hydrogen ions (H-) in water
d.
forms hydroxide ions (OH-) in water
Hint
7.
In the following chemical reaction, what does the subscript 2 mean? HCl + NaOH --> H
2
O + NaCl
a.
Two oxygen atoms are combined with one hydrogen atom.
b.
There are two combinations of water.
c.
Two hydrogen atoms are combined with one oxygen atom.
d.
There are two water molecules.
Hint
8.
When two amino acids combine with each other, they do so by __________.
a.
ionic bonding
b.
condensation
c.
radiation
d.
hydrolysis
Hint
9.
Which of the following describes an ionic bond?
a.
involves gaining or losing electrons
b.
involves sharing of electrons
c.
involves gaining or losing neutrons
d.
found in most compounds in organisms
Hint
10.
Which of the following is a compound?
a.
potassium
b.
chlorine
c.
water
d.
hydrogen
Hint
11.
Which of the following is NOT a function of water in living organisms?
a.
transports oxygen in the blood
b.
acts as a mean of transporting materials
c.
acts as a solvent
d.
resists temperature changes
Hint
12.
The second energy level of an atom can hold a maximum of how many electrons?
a.
18
b.
24
c.
2
d.
8
Hint
13.
What are the basic building blocks of carbohydrates?
a.
fatty acids
b.
amino acids
c.
nucleic acids
d.
monosaccharides
Hint
14.
The center of the atom is called the __________.
a.
proton
b.
nucleus
c.
electrons
d.
neutron
Hint
15.
What substance cannot be broken down into a simpler substance?
a.
element
b.
compound
c.
water
d.
molecule
Hint
