Name: 
 

Test One Practice



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

 1. 

Which of the following properties or processes do we associate with living things?
a.
evolutionary adaptations
b.
energy processing
c.
responding to the environment
d.
growth and reproduction
e.
all of the above
 

 2. 

A localized group of organisms that belong to the same species is called a
a.
biosystem.
b.
community.
c.
population.
d.
ecosystem.
e.
family.
 

 3. 

Which of these individuals is most likely to be successful in an evolutionary sense?
a.
a reproductively sterile individual who never falls ill
b.
an organism that dies after 5 days of life but leaves 10 offspring, all of whom survive to reproduce
c.
a male who mates with 20 females and fathers 1 offspring
d.
an organism that lives 100 years and leaves 2 offspring, both of whom survive to reproduce
e.
a female who mates with 20 males and produces 1 offspring
 

 4. 

In a hypothetical world, every 50 years people over 6 feet tall are eliminated from the population. Based on your knowledge of natural selection, you would predict that the average height of the human population will
a.
remain unchanged.
b.
gradually decline.
c.
rapidly decline.
d.
gradually increase.
e.
rapidly increase.
 

 5. 

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?
a.
nitrogen
b.
calcium
c.
iodine
d.
sodium
e.
phosphorus
 

 6. 

Which of the following statements is false?
a.
Atoms of the various elements differ in their number of subatomic particles.
b.
All atoms of a particular element have the same number of protons in their nuclei.
c.
The neutrons and protons present in the nucleus of an atom are almost identical in mass; each has a mass of about 1 dalton.
d.
An atom is the smallest unit of an element that still retains the properties of the element.
e.
Protons and electrons are electrically charged particles. Protons have one unit of negative charge, and electrons have one unit of positive charge.
 

 7. 

Which of the following best describes the relationship between the atoms described below?

Atom 1
Atom 2
mc007-1.jpg
mc007-2.jpg
a.
They contain 31 and 32 electrons, respectively.
b.
They are both phosphorus cations.
c.
They are both phosphorus anions.
d.
They are both isotopes of phosphorus.
e.
They contain 31 and 32 protons, respectively.
 

 8. 

What is the valence of an atom with six electrons in its outer electron shell?
a.
1
b.
2
c.
3
d.
4
e.
5
 

 9. 

A covalent chemical bond is one in which
a.
electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged.
b.
protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.
c.
outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.
d.
outer-shell electrons of one atom are transferred to the inner electron shells of another atom.
e.
the inner-shell electrons of one atom are transferred to the outer shell of another atom.
 

 10. 

Which of the following would be regarded as compounds?
a.
mc010-1.jpg
b.
mc010-2.jpg
c.
mc010-3.jpg
d.
mc010-4.jpg
e.
B and D, but not A and C
 

 11. 

The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?
a.
a covalent bond
b.
a hydrogen bond
c.
an ionic bond
d.
a hydrophilic bond
e.
a hydrophobic bond
 

 12. 

Water is able to form hydrogen bonds because
a.
oxygen has a valence of 2.
b.
the water molecule is shaped like a tetrahedron.
c.
the bonds that hold together the atoms in a water molecule are polar covalent bonds.
d.
the oxygen atom in a water molecule has a weak positive charge.
e.
each of the hydrogen atoms in a water molecule is weakly negative in charge.
 

 13. 

Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon?
a.
the change in density when it condenses to form a liquid or solid
b.
reactions with other atmospheric compounds
c.
the release of heat by the formation of hydrogen bonds
d.
the release of heat by the breaking of hydrogen bonds
e.
the high surface tension of water
 

 14. 

Which of the following solutions has the greatest concentration of hydrogen ions [Hmc014-1.jpg]?
a.
gastric juice at pH 2
b.
vinegar at pH 3
c.
tomato juice at pH 4
d.
black coffee at pH 5
e.
household bleach at pH 12
 

 15. 

If the pH of a solution is decreased from 9 to 8, it means that the
a.
concentration of Hmc015-1.jpg has decreased to one-tenth (1/10) what it was at pH 9.
b.
concentration of Hmc015-2.jpg has increased 10-fold (10X) compared to what it was at pH 9.
c.
concentration of OHmc015-3.jpg has increased 10-fold (10X) compared to what it was at pH 9.
d.
concentration of OHmc015-4.jpg has decreased to one-tenth (1/10) what it was at pH 9.
e.
Both B and D are correct.
 

 16. 

Buffers are substances that help resist shifts in pH by
a.
releasing Hmc016-1.jpg in acidic solutions.
b.
donating Hmc016-2.jpg to a solution when they have been depleted.
c.
releasing OHmc016-3.jpg in basic solutions.
d.
accepting Hmc016-4.jpg when the are in excess.
e.
Both B and D are correct.
 



 
Check Your Work     Start Over