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BIOLOGY 160 PRACTICE EXAM 1
1. What structure would you find in a plant cell that you would not find in an animal cell?
a. Golgi body
b. nucleus
c. mitochondrion
d. chloroplast
e. all of these are found in both plant and animal cells
2. Which of the following can bring about a change in protein shape?
a. temperature
b. pH
c. either a or b
d. none of the above
3. Which of the following is considered a macromolecule?
a. glucose
b. amino acid
c. fatty acid
d. nucleic acid
e. all of the above.
4.
a.
b.
c.
d.
Which of the following characteristics is associated with electrons?
positive charge
located in the nucleus
mass equal to a neutron
negative charge
5.
a.
b.
c.
d.
An atom has an atomic number of seven. How many electrons are in its outer shell?
2
5
7
14
6.
a.
b.
c.
d.
An atom that gains two electrons becomes a(n):
positively charged ion
negatively charged ion
polar molecule
covalent molecule
7. Atom A has four electrons in its outer shell. In the vast majority of cases, an atom of
this type will form ______ bonds with other atoms.
a. polar
b. hydrogen
c. ionic
d. covalent
8. The bonds in organic molecules are usually _____ bonds because carbon atoms tend to
________electrons.
a. ionic; share
b. ionic; transfer
c. covalent; share
d. covalent; transfer
9. Water molecules are:
a. polar
b. non-polar
c. cohesive
d. all of the above
e. A and C only
10. In a __________ covalent bond, two atoms share two pairs of electrons.
a. single
b. double
c. triple
11. The macromolecules containing hereditary information and are found in:
a. chromosomes
b. triglycerides
c. nucleic acids
d. polysaccharides
e. both a and c
12. In the digestive process, macromolecules are broken down into small molecules that
can cross cell membranes. This process is called:
a. hydrolysis
b. dehydration synthesis
c. cellular respiration
d. protein synthesis
13. The functional group(s) associated with amino acids is/are:
a. hydroxyl
b. phosphate
c. amino
d. carboxyl
e. both amino and carboxyl
14. The following equation (G stands for glucose) G + G + G ---------> G-G-G + 2H2O,
is an example of:
a. ionic bond formation
b. peptide bond formation
c. dehydration synthesis
d. hydrolysis
15. Which of the following statements is always true? All cells:
a. have a cell membrane
b. contain a nucleus
c. have a cell wall
d. both A and B are always true
16. Which of the following forms of life is NOT eukaryotic?
a. a protist such as an amoeba
b. a plant cell such as Elodea
c. a bacterial cell such as Streptococcus
d. a human cell such as a red blood cell
17. Which of the following substances is able to move freely across the cell membrane?
a. water
b. lipid soluble molecules
c. water soluble proteins
d. both a and b
18. A cell that had relatively few energy needs would probably have a relatively small
number of:
a. chromosomes
b. lysosomes
c. ribosomes
d. mitochondria
19. When a cell is deprived of oxygen, its lysosomes tend to burst and release their
contents into the cell. As a result of this, that cell will:
a. undergo autolysis (self-digestion)
b. recycle damaged organelles
c. undergo cell division
d. produce additional ER
e. produce replacement lysosomes
20. A plant cell placed in a hypotonic solution would:
a. shrink
b. burst
c. become turgid
d. remain unchanged
21. When red blood cells are placed in a concentrated salt solution, they will:
a. enlarge, but not burst
b. enlarge until they burst
c. remain unchanged
d. shrink
e. none of the above
22. An uncharged atom of gold has an atomic number of 79 and an atomic mass of 197.
This atom has _____ protons, ______ neutrons, and ______ electrons.
a. 79, 118, 79
b. 118, 79, 118
c. 276, 118, 79
d. 118, 276, 118
e. 79, 276, 79
23. Life is organized in a hierarchical fashion. Which of the following sequences
correctly illustrates that hierarchy as it goes upward?
a. ecosystem, population, organ system, cell, community, molecule, organ, organism
b. organism, organ system, population, organ, community, cell, ecosystem, molecule
c cell, molecule, organ system, organ, population, organism, ecosystem, community
d. molecule, cell, organ, organ system, organism, population, community, ecosystem
e. ecosystem, molecule, cell, organism, organ system, population, organ, community
24. The cytoskeleton of the cell functions to:
a. give the cell shape
b. anchor organelles
c. allow organelles to move
d. all of the above.
25. The hydrogen atoms of a water molecule are bonded to the oxygen atoms by _______
bonds, whereas neighboring water molecules are held together by _______ bonds.
a. polar covalent; hydrogen
b. hydrogen; polar covalent
c. hydrogen; ionic
d. polar covalent; ionic
e. ionic; covalent
26. Which of the following is an example of secondary structure in a protein?
a. a particular amino acid sequence
b. an alpha helix
c. a globular shape
d. a pleated sheet
e. both b and d
27. A manufacturing company dumps its wastes into a nearby pond. One of the wastes is
found to paralyze the contractile vacuoles of certain protists. A biologist looking at one of
these organisms would find that the organism:
a. has lost water and shrunk
b. is surviving but is unable to reproduce
c. has died because wastes have accumulated in the cytoplasm
d. has gained water and burst
e. has died of malnutrition
28. In lab, one uses a special balloon that is permeable to water but not sucrose to make
an “artificial cell.” The balloon is filled with a solution of 20 percent sucrose and is
immersed in a beaker containing a solution of 40 percent sucrose. Which of the following
will occur?
a. Sucrose will leave the balloon.
b. Sucrose will enter the balloon.
c. Water will enter the balloon.
d. Water will leave the balloon.
e. both a and d
29. Which of the following pieces of evidence would prove that a substance enters a cell
by active rather than passive transport?
a. The substance is moved across the cell membrane by a carrier protein.
b. The substance enters the cell when its concentration is higher outside the cell than
inside.
c. The breakdown of ATP is needed for the transport to occur.
d. both a and c
e. all of the above
30. Which of the following molecules would cross a cell membrane most easily? Assume
no active transport or facilitated diffusion.
a. polar amino acid.
b. starch.
c. protein.
d. lipid-soluble substance.
31. Facilitated diffusion:
a. involves a protein carrier and requires energy.
b. involves a protein carrier but does not require energy.
c. requires energy but does not require a protein carrier.
d. moves substances from a region of lower concentration to a region of higher
concentration.
e. does not require energy or a protein carrier.
32. In all cells, the energy used in active transport is provided by:
a. ATP.
b. enzymes.
c. gravity.
d. random molecular motion.
33. What is the organelle shown in the diagram?
a. cytoplasm
b. endoplasmic reticulum
c. mitochondrion
d. Golgi body
e. none of the above