Download Chapter 4 Review - Key

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Chapter 4 Review
1 . Which statement about the plasma membrane is false?
a. It acts as a selectively permeable barrier.
b. It consists of a phospholipid bilayer and proteins.
c. It functions in communication between cells.
d. It contributes to cell shape.
e. Lipids function to allow movement of the cell.
2. Prokaryotic cells can have all of the following except
a. flagella.
b. internal membranes.
c. a nucleus.
d. a cytoskeleton.
e. a cell wall.
3. From the list below, choose the lettered descriptions that apply to each of these
eukaryotic cell organelles: mitochondrion, chloroplast, glyoxysome, peroxisome, and
vacuole.
A. Found in animal cells
B. Found in plant cells
C. Divides autonomously
D. Enclosed by membrane
E. Function may be related to storage or breakdown of toxic chemicals
F. Function in energy transformation
G. Contains internal membranes
Mitochondrion: A, B, C, D, F, G
Chloroplast: B, C, D, F, G
Glyoxysome: B, D
Peroxisome: A, B, D, E
Vacuole: A, B, D, E
4. Cell structure reflects cell function. Using your knowledge of the functions of particular
organelles, select the incorrect match of a type of cell and the organelle that might be
particularly abundant in that cell:
a.
Pancreatic cell that secretes a digestive enzyme: Rough endoplasmic reticulum
b.
Mammalian skin cell: Central vacuole
c.
Skeletal muscle cell: Mitochondria
d.
Liver cell that modifies toxins: Smooth endoplasmic reticulum
e.
Leaf cell: Chloroplasts
5. Which of the following statements is false?
a. Intermediate filaments form the interior skeleton for cilia and flagella.
b. Cilia can either move a cell or move fluid over a stationary cell.
c. Cilia typically outnumber flagella on a cell.
d. Motor proteins drive the motion of cilia and flagella.
e. Cilia and flagella have a 9  2 arrangement of microtubules.
6. Indicate whether each of the following statements about plant cell walls is true or false.
Correct any false statements.
1. The cell wall provides support and maintains the shape of a plant cell.
2. The cell wall is composed of proteoglycans and collagen.
3. Cell walls isolate individual plant cells so there are no connections between adjacent
cells.
4. The cell wall is flexible, allowing easy expansion of a plant cell as it grows.
5. The cell wall can help resist infection by plant disease organisms.
1. True.
2. False. The cell wall is composed of cellulose.
3. False. Plasmodesmata are channels that run through cell walls and connect the
cytoplasm of adjacent plant cells.
4. False. The cell wall is somewhat rigid, limiting the expansion of a plant cell to a
maximum size at maturity.
5. True.
7. Determine which type of junction is most likely to be found in the following locations in
the human body:
1. Epithelial lining of the urinary bladder (prevents urine from leaking into the body)
2. Skin
3. Epithelial lining of the stomach (prevents stomach contents from leaking into the body)
4. Cardiac muscle (the rapid spread of electric current mediated by ions is critical for cardiac
muscle cells to beat in unison)
1.
2.
3.
4.
Tight junctions
Desmosomes
Tight junctions
Gap junctions
Which type of junction in animal cells is most similar to the plasmodesmata of plant cells?
The gap junctions of animal cells are most similar to the plasmodesmata of plant cells.
8. Choose the phrase that incorrectly completes the sentence: The extracellular matrices of
animal cells
a.
b.
c.
d.
e.
contain the fibrous protein collagen.
contain the polysaccharide cellulose.
interact with cell membrane proteins to regulate cell attachment.
contain proteoglycans in a gel-like matrix.
help filter materials passing between different tissues.