1. Chapter 4: Cell Structure and Function
Practice Test
answers

2. The combination of what features would be found in a prokaryotic cell?
nucleoid, ribosome, cell wall
cell wall, nucleus, chloroplast
mitochondrion, cell wall, flagellum
nucleoid, mitochondrion, cilia 1 2 3 4 5

3. All cells possess a plasma membrane, which functions to ________.
enclose the cell
isolate the cell from random disturbances in the environment
allow metabolic events to occur in an orderly fashion
all of the choices 1 2 3 4 5

4. Cells are typically small because ________.
a greater number of small cells can occupy any space compared to larger cells
just like sand and gravel, smaller objects can pack together more tightly
their volumes increase at a faster rate than the surface area
small cells require less food than large cells

5. In eukaryotes, the nucleus ________.
is always located in the center of the cell
isolates the DNA from exposure to damaging chemical reactions
is the site where most proteins are synthesized
all of the choices 1 2 3 4 5

6. centrioles and nucleosomes mitochondria and ribosomes
The endosymbiotic theory suggests that both ________ were once free-living organisms that lived as parasites within ancient prokaryotes.
centrioles and nucleosomes
mitochondria and ribosomes
Golgi bodies and lysosomes
chloroplasts and mitochondria 1 2 3 4 5

7. Actin is the primary component of ________.
intermediate fibers
microfilaments
microtubules
all of the choices 1 2 3 4 5

8. Bacterial cell walls often contain a polysaccharide capsule, which functions to ________.
poison heterotrophs that might attempt to feed on the bacteria
aid in cell attachment
focus light and improve photosynthesis
selectively regulate what materials enter and leave the cell 1 2 3 4 5

9. In addition to the plasma membrane, all cells begin life with ________.
a cell wall
DNA and cytoplasm
mitochondria and ribosomes
plastids and vacuoles 1 2 3 4 5

10. A cell membrane is formed from a lipid bilayer and protein; what functional contribution does the lipid bilayer contribute?
it lubricates cell surfaces and reduces friction with the environment
it serves as a source of energy
it prevents the free passage of water-soluble substances across it
all of the choices 1 2 3 4 5

11. Which combinations of features are unique to plant cells?
cell wall, central vacuole, chloroplast
chloroplast, lysosome, Golgi body
central vacuole, nucleoplasm, centriole
cell wall, mitochondrion, plasmadesmata 1 2 3 4 5

12. Lysosomes contain ________ and bud from the ________.
waste products, rough ER
waste products, Golgi body
digestive enzymes, smooth ER
digestive enzymes, Golgi body 1 2 3 4 5

13. Match the organelle with the appropriate activity.
mitochondria - synthesis of ATP
smooth ER - synthesis of protein
chromoplast - synthesis of lysosomes
rough ER - processes materials for exocytosis 1 2 3 4 5

14. Which organelle has inner and outer compartments and an inner membrane containing ATP synthase?
the nucleus
the Golgi body
the mitochondrion
the centriole 1 2 3 4 5

15. What kind of cell junctions allow rapid flow of substances into the cytoplasm of adjacent cells?
plasmodesmata and gap junctions
adhering junctions and tight junctions
tight junctions and plasmodesmata
gap junctions and adhering junctions 1 2 3 4 5

16. The cytoskeleton functions in eukaryotes to ________.
reinforce the structure of the cell
move the cell through the physical environment
move cellular components through the cytoplasm
all of the choices 1 2 3 4 5