DATE: NAME: CLASS:
BLM 9-8
Unit 3 Test Key
ASSESSMENT
Goal • Demonstrate your understanding of the information presented in Unit 3.
Multiple Choice
Circle the letter for the choice that best completes the statement or answers the question.
1. Which type of cell or cell organelle does not have a high surface area-to-volume ratio?
(a) plant root hairs
(b) Golgi apparatus
(c) cells lining the digestive tract
(d) vacuole
2. Which organelle produces proteins?
(a) nucleus
(b) lysosome
(c) ribosomes
(d) vacuole
3. What kind of environment occurs when the concentration of dissolved substances is greater
outside the cell
than inside the cell?
(a) hypotonic
(b) hypertonic
(c) isotonic
(d) saline
4. An amoeba ingests large food particles by
(a) osmosis
(b) diffusion
(c) endocytosis
(d) exocytosis
5. In the surface area-to-volume ratio, what structure does the surface area represent?
(a) cytoplasm
(b) mitochondria
(c) endoplasmic reticulum
(d) plasma membrane
6. What is a main idea of the cell theory?
(a) All cells have a plasma membrane.
(b) All cells come from pre-existing cells.
(c) All cells are microscopic.
(d) All cells are made of atoms.
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DATE: NAME: CLASS:
BLM 9-8
Unit 3 Test
ASSESSMENT
(continued)
7. A three-dimensional image of the interior of a specimen can be viewed with a
(a) compound light microscope
(b) scanning electron microscope
(c) transmission electron microscope
(d) scanning tunnelling microscope
8. A ribosome
(a) does not have a cell wall
(b) is not surrounded by a membrane
(c) does not contain cytoplasm
(d) all of the above
9. Which structure is found in rough endoplasmic reticulum but not in smooth endoplasmic
reticulum?
(a) ribosomes
(b) cytoplasm
(c) a nucleus
(d) mitochondria
10. The small size of cells is best correlated with
(a) the fact that they are self-reproducing
(b) their prokaryotic versus eukaryotic nature
(c) an adequate surface area for the exchange of materials
(d) their vast versatility
11. Vesicles from the smooth endoplasmic reticulum are most likely on their way to the
(a) rough endoplasmic reticulum
(b) lysosomes
(c) Golgi apparatus
(d) plant cell vacuole
12. Lysosomes function in
(a) protein synthesis
(b) processing and packaging
(c) intracellular digestion
(d) all of these are correct
13. The fluid-mosaic model of membrane structure refers to
(a) the fluidity of proteins and the pattern of phospholipids in the membrane
(b) the fluidity of phospholipids and the pattern of proteins in the membrane
(c) the fluidity of cholesterol and the pattern of sugar chains outside the membrane
(d) the lack of fluidity of internal membranes compared with the plasma membrane, and the
ability of proteins
to move laterally in the membrane
Copyright © 2004 McGraw-Hill Ryerson Limited. Permission to edit and reproduce this page is granted to the purchaser for use in her/his classroom.
McGraw-Hill Ryerson shall not
be held responsible for content if any revisions, additions, or deletions are made to this page.
DATE: NAME: CLASS:
BLM 9-8
Unit 3 Test
ASSESSMENT
(continued)
14. A phospholipid molecule has a head and two tails. Where are the tails found?
(a) at the surfaces of the membranes
(b) in the interior of the membrane
(c) spanning the membrane
(d) where the environment is hydrophilic
15. A scientist who is observing a protozoan notices a vacuole discharging its contents at the cell
membrane. This
is an example of
(a) phagocytosis and vacuole formation
(b) endocytosis and active transport
(c) exocytosis and secretion
(d) active transport and vacuole release
16. When are stomata usually open?
(a) at night, when the plant requires a supply of oxygen
(b) during the day, when the plant requires a supply of carbon dioxide
(c) whenever there is excess water in the soil
(d) all of the above
17. What is the role of transpiration in water and mineral transport?
(a) Transpiration causes water molecules to be cohesive and cling together.
(b) Transpiration occurs in vessel elements but not in the tracheids that have end walls.
(c) Transpiration is the force that causes sugar to be transported in xylem sap.
(d) Transpiration creates the tension that draws a column of water up the vessel elements.
18. Root hairs do not play a role in
(a) oxygen uptake
(b) mineral uptake
(c) water uptake
(d) carbon dioxide uptake
19. Which statement is correct?
(a) Both stems and roots show positive gravitropism.
(b) Both stems and roots show negative gravitropism.
(c) Only stems show positive gravitropism.
(d) Only roots show positive gravitropism.
20. Which process can move molecules against a concentration gradient?
(a) diffusion
(b) active transport
(c) facilitated diffusion
(d) osmosis
Copyright © 2004 McGraw-Hill Ryerson Limited. Permission to edit and reproduce this page is granted to the purchaser for use in her/his classroom.
McGraw-Hill Ryerson shall not
be held responsible for content if any revisions, additions, or deletions are made to this page.
DATE: NAME: CLASS:
BLM 9-8
Unit 3 Test
ASSESSMENT
(continued)
21. Which type of cell is non-living at maturity?
(a) guard cells
(b) epidermal cells in roots
(c) tracheids
(d) sieve cells
22. What happens at lenticels?
(a) gas exchange
(b) water absorption
(c) photosynthesis
(d) phototropism
23. The liquid in the phloem contains 10 to 25 percent dissolved solid matter. This solid matter is
primarily
(a) starch
(b) sucrose
(c) protein
(d) lipids
24. If you wanted to increase the turgor pressure in a plant inside your home, you would
(a) move the plant to a dark room
(b) add essential nutrients to the soil
(c) add water to the soil
(d) add salt water to the soil
Short Answer
Answer each question in the space provided. Be sure to use complete sentences.
25. How would you expect the number of mitochondria in a cell to be related to the amount of
active transport the
cell carries out?
26. Explain the part of the cell theory that is credited to each scientist.
(a) Theodor Schwann
The cell is the unit of structure, physiology, and
organization in living things. 2) The cell retains a dual existence as a distinct entity
and a building block in the construction of organisms.
(b) Rudolf Virchow
"All cells only arise from pre-existing cells".
(c) Anton van Leeuwenhoek
Was the first to observe protazoa and bacteria using magnification.
Copyright © 2004 McGraw-Hill Ryerson Limited. Permission to edit and reproduce this page is granted to the purchaser for use in her/his classroom.
McGraw-Hill Ryerson shall not
be held responsible for content if any revisions, additions, or deletions are made to this page.
DATE: NAME: CLASS:
BLM 9-8
Unit 3 Test
ASSESSMENT
(continued)
27. Compare the expected rates of water movement in xylem tissues during the day and during
the night.
Due to transpiration, water movement in the xylem would be greater during the day as compared
to the night. The evaporation of water from the leaves of the plant would cause water to be drawn
up through the xylem at a greater rate.
28. What would happen to a cell if its cell membrane were permeable rather than semipermeable?
A cell which had a permeable rather than semi-permeable membrane, would probably cease to
function due to toxins coming into the cell or vital components leaving the cell or extreme loss or
gain of fluid volume.
29. (a) What is the function of leaf epidermis, and how does the structure suit the function?
The epidermis prevents water loss in the leaf. The cuticle layer , which is waxy, helps prevent
evaporation from the leaf. The thickness of the epidermis also allows it to function as a
successful barrier to evaporation.
(b) What is the function of the spongy tissue cells, and how does the structure suit the function?
The spongy cells are photosynthetic which means they provide energy for the plant.
(c) What is the function of the leaf veins, and how does the structure suit the function?
Leaf veins help distribute nutrients to the various living cells within the leaf. Their branching
structure helps to distribute the nutrients to all the different areas of the leaf.