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Unit Test Homeostasis-DO NOT WRITE ON THE EXAM. RECORD ALL ANSWERS ON YOUR ANSWER SHEET.
1. If a cell is placed in salt water, water will leave
the cell by:
A. Diffusion
B. Concentration gradient
C. Osmosis
D. Active Transport
2. Which of these is an example of homeostasis in
a multicellular organism?
A. Inheriting a gene
B. Growing larger and stronger
C. Drinking an excessive amount of sugar
water
D. Regulating body temperature
6. A cell which normally lives in a 10% saltwater
solution was moved into another solution.
Which of these solutions would cause the cell to
increase in size at the greatest rate?
A. 0% saltwater solution
B. 5% saltwater solution
C. 10% saltwater solution
D. 20% saltwater solution
7. Diffusion can be defined as particles moving:
A. from left to right.
B. from right to left.
C. from an area of high concentration to
an area of low concentration.
D. from an area of low concentration to an
area of high concentration.
Examine the following diagram of the cell membrane:
8. The tendency of organisms to maintain a stable
internal environment is called
A. Cellular Organization
B. Homeostasis
C. Active Transport
D. Metabolism
3. What kind of a molecule is Structure A?
A. Homogenate
B. Phospholipid
C. Protein
D. Organelle
4. Which of these body systems is responsible for
the removal of metabolic wastes from the
blood?
A. Respiratory
B. Circulatory
C. Urinary (Excretory)
D. Digestive
5. A particular toxin prevents cellular production
of usable energy. Cells that are affected by this
toxin are unable to carry out many of their
normal functions. Which of these organelles
would be most directly harmed by this toxin?
A. Ribosomes
B. The Nucleus
C. Mitochondria
D. The Vacuole
Examine the following diagram of the cell membrane:
9. Of the parts labeled above, which part of the
cell membrane is hydrophobic?
A. Part 1
B. Part 2
C. Structure B
D. Outside the Cell
Unit Test Homeostasis-DO NOT WRITE ON THE EXAM. RECORD ALL ANSWERS ON YOUR ANSWER SHEET.
10. A student observes a unicellular organism under
a microscope. After a while, the organism
begins to split into two cells, as shown in the
diagram.
Which of these structures does the organism
shown above use to move itself?
A. Cilia
B. Ribosomes
C. Flagella
D. Pseudopodia
11. Which part of the cell is responsible for
capturing sunlight and making food for the cell?
A. Golgi Apparatus
B. Chloroplasts
C. Mitochondria
D. Cytoplasm
12. Spartina, a cord grass, grows in salt marshes
and stores salt in its roots. This makes the salt
concentration in its roots greater than that of
the surrounding water. What most likely occurs
in response to this salt concentration in the
roots?
A. Salt moves into the roots
B. Water moves into the roots
C. Nutrients move out of the roots
D. Water moves out of the leaves into the
air
13. The difference between active and passive
transport involves:
A. the level of activity of one over the
other.
B. the use of energy of one over the other.
C. the direction of transport of one over
the other.
D. the rate of transport of one over the
other.
14. Nutrients taken in by the body are broken down
during cell processes. Some products of these
cell processes can be harmful if not removed
from the body.
Describe how harmful waste products are
removed from the body. In your response, be
sure to:

identify the parts of a cell that are
involved in waste removal

identify the body systems involved
in the removal of waste products

explain how the body systems work
together to remove waste from the
body
Write your response to Question 14 on the back of
your answer document.
15. The exchange of oxygen
and carbon dioxide
between the body and
the air occurs in the
lungs. This exchange of
gases takes place at the
cellular level.
What part of the cell is primarily responsible for
this exchange?
A. The Cell Membrane
B. The Nucleus
C. The Cell Wall
D. The Ribosome
16. Euglena uses which of these to move?
A.
B.
C.
D.
Cilia
Vacuole
Flagella
Pseudopodia
Unit Test Homeostasis-DO NOT WRITE ON THE EXAM. RECORD ALL ANSWERS ON YOUR ANSWER SHEET.
17. Which of these organelles use oxygen to
produce energy for the cell?
A. Nuclei
B. Ribosomes
C. Endoplasmic Reticulum
D. Mitochondria
18. A student designed an experiment to see if
plants grow better when watered with a sugar
solution. He divided the plants into six groups,
measured the initial height of each plant, and
calculated the average height for each group.
Once a week for two months, he watered the
plants in each group using a different sugar
solution for each plant group. At the end of two
months, he measured the final height of each
plant and calculated the average height for each
group. The student’s data are shown in the
table below.
19. A cell moves particles from a region of low
concentration to a region of high concentration
by:
A. active transport.
B. osmosis.
C. passive transport.
D. diffusion.
20. The structure most responsible for maintaining
cell homeostasis is the:
A. Cytoplasm
B. Cell Wall
C. Cell Membrane
D. Mitochondria
21. Which cell structure contains molecules that
direct cell activities?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Chloroplast
22. A student observed different types of cells
under a microscope. Four of the cells he
observed are shown below:
Which of these statements explains why the
plants in Groups E and F died?
A. The high sugar content caused too
much water to move out of the root
cells.
B. The high sugar content caused too
much water to move into the root cells
C. The high sugar content prevented the
plant from capturing energy.
D. The high sugar content clogged the
pores in the cell membrane
Cell 3 is an example of a(n):
A. Prokaryotic Cell
B. Animal Cell
C. Plant Cell
D. Fungi Cell
Unit Test Homeostasis-DO NOT WRITE ON THE EXAM. RECORD ALL ANSWERS ON YOUR ANSWER SHEET.
23. A student is setting up an experiment using a
type of bag that is permeable to water, but not
to sugar. She will fill and weigh three bags and
place each bag into a different beaker. The
diagram below shows the contents of the bags
and the beakers at the start of the experiment.
If the beakers are left alone, which of the bags
will increase in size after 24 hours?
A. The bag in Beaker 1
B. The bag in Beaker 2
C. The bag in Beaker 3
D. The bags in Beakers 1 & 3
24. If I place a potato in a solution and the next day
the mass of the potato decreased, it was placed
in a(n) ___________________ solution
A. Hypotonic
B. Hypertonic
C. Isotonic
D. Cannot be determined from the
information given.
25. The respiratory system brings oxygen into the
body from the environment. Which of these
body systems is directly involved in the delivery
of oxygen to the major organs of the human
body?
A. The Nervous System
B. The Digestive System
C. The Excretory System
D. The Circulatory System
26. Keratin is a protein found in hair. Where in a
cell is keratin made?
A. The nucleus
B. The vacuole
C. The ribosomes
D. The mitochondria
27. Which of these structures are found in plant
cells but not in animal cells?
A.
B.
C.
D.
A cell membrane
Chloroplasts
Endoplasmic Reticulum
Mitochondria
Use the following diagram and information to answer
questions 28 and 29 below:
28. Starch turns blue-black in the presence of
iodine solution. A selectively permeable dialysis
sac containing a starch solution is placed into a
beaker of iodine solution.
If the dialysis sac is permeable only to water
and iodine, what will the solutions in the beaker
and the sac look like after two hours?
A. The iodine solution in the beaker will
turn blue-black; the starch solution will
not change.
B. The starch solution in the dialysis sac
will turn blue-black; the iodine solution
will not change.
C. Neither solution will turn blue-black.
D. Both solutions will turn blue-black.
29. Which of these processes is demonstrated by
the experiment shown in the diagram?
A. Active transport
B. Isotonic solutions
C. Equilibrium
D. Diffusion
Unit Test Homeostasis-DO NOT WRITE ON THE EXAM. RECORD ALL ANSWERS ON YOUR ANSWER SHEET.
Write your response to Question 30 on the back of your answer document.
30. A student cut three identical slices from a potato. She determined the mass of each slice and placed them into
labeled beakers. She then added a different solution to each beaker. After 20 minutes, she removed each
potato slice from its solution, dried it with a paper towel, and determined its mass. Results of this experiment
are shown in the table below.
Beaker
Solution
Change in Mass
1
Distilled Water
Gained 3 grams
2
5% Salt Solution
Lost 0.3 grams
3
15% Salt Solution
Lost 4.6 grams

Name and define the process that caused the change in mass for each potato.

Explain why each potato slice had a different mass after 20 minutes.