Molecules: Atom and Ans

Anatomy & Physiology Name ________________________________
Organic Molecules Review

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 1. Ions are
a.
electrically neutral fragments of a molecule that has been split apart.
b.
polar molecules
c.
radioactive isotopes that give off alpha, beta, or gamma
d.
charged atoms or molecules that have gained or lost electrons.

____ 2. Sodium has eleven protons. How many electrons does it have in its outermost shell?
a.
one
b.
two
c.
four
d.
six

____ 3. Chlorine, with an atomic number of 17, would be expected to have ___ electrons in its outer shell.
a.
five
b.
seven
c.
three
d.
one

____ 4. The negatively charged subatomic particle is the
a.
electron.
b.
proton.
c.
neutron.
d.
nucleus.

____ 5. Isotopes of an element differ from other isotopes of the same element in their
a.
atomic number.
b.
number of electrons.
c.
number of neutrons.
d.
number of protons.

____ 6. Which of the following includes the others?
a.
protons
b.
neutrons
c.
electrons
d.
atoms

____ 7. What holds together the two strands of a DNA molecule?
a.
hydrogen bonds
b.
covalent bonds
c.
polar ionic bonds
d.
nonpolar ionic bonds

____ 8. The maximum number of electrons in the shell closest to the nucleus is
a.
four.
b.
eight.
c.
two.
d.
one.

____ 9. A molecule of liquid water
a.
is nonpolar.
b.
is locked in a rigid three-dimensional lattice
c.
has no charge
d.
forms covalent bonds with other water molecules

____ 10. The atoms in molecules of oxygen gas and nitrogen gas are held together by
a.
nonpolar covalent bonds
b.
hydrogen bonds
c.
ionic bonds
d.
polar covalent bonds

____ 11. Sucrose is formed from fructose and glucose by
a.
an electron transfer.
b.
a cleavage reaction.
c.
dehydration synthesis.
d.
a rearrangement.

____ 12. Glycogen, cellulose, and