MicroBiology chapter 4 practice exam

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Bio 225 Chapter 4 Practice Questions

1.Which of the following is not a distinguishing characteristic of prokaryotic cells? a.Their DNA is not associated with histones.
b.They have cell walls containing peptidoglycan.
c.They lack membrane-enclosed organelles.
d.Their DNA is not enclosed within a membrane.
e.None of the above.

2.Which of the following is not true about a gram-positive cell wall? a.It contains teichoic acids.
b.It protects the cell in a hypertonic environment.
c.It is sensitive to lysozyme.
d.It maintains the shape of the cell.
e.None of the above.

3.Which of the following best describes what happens when a bacterial cell is placed in a solution containing 5% NaCl? a.Water will move out of the cell.
b.Sucrose will move into the cell from a higher to a lower concentration. c.The cell will undergo osmotic lysis.
d.Water will move into the cell.
e.No change will result; the solution is isotonic.

4.The best definition of osmotic pressure is
a.The movement of solute molecules from a higher to a lower concentration. b.The force with which a solvent moves across a semi-permeable membrane from a higher to a lower concentration. c.The movement of a substance across a semi-permeable membrane from a higher to a lower concentration. d.The movement of solute molecules from a lower to a higher concentration across a semi-permeable membrane. e.The active transport of a substance out of a cell to maintain equilibrium.

5.By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration? a.Active transport
b.Simple diffusion
c.Extracellular enzymes
d.Facilitated diffusion
e.Any of the above

6.Which of the following is not a characteristic of the plasma membrane? a.Contains proteins
b.Maintains cell shape
c.Selectively permeable
d.Composed of a phospholipid bilayer
e.The site of cell wall formation

7.All of the following are lacking a cell wall except
a.Protoplasts.
b.Animal cells.
c.L forms.
d.Fungi.
e.Mycoplasmas.

8.Which of the following statements is true?
a.Endospores allow a cell to survive environmental changes. b.Endospores are easily stained in a Gram stain.
c.Endospores are for reproduction.
d.A cell can produce many endospores.
e.A cell produces one endospore and keeps growing.

9.Which of the following pairs is mismatched?
a.Lysosome - digestive enzymes
b.Golgi complex - secretion
c.Mitochondria - ATP production
d.Endoplasmic reticulum - internal transport
e.Centrosome - food storage

10.Which of the following organelles most closely resembles a prokaryotic cell? a.Vacuole
b.Nucleus
c.Golgi complex
d.Mitochondrion
e.Cell wall

11.Which of the following is generally not true of prokaryotic cells? a.They have a semirigid cell wall.
b.They possess 80S ribosomes.
c.They are motile by means of flagella.
d.They reproduce by binary fission.
e.None of the above.

12.Which of the following is not true about gram-negative cell walls? a.They have an extra outer layer composed of lipoproteins, lipopolysaccharides, and phospholipids. b.They are toxic to humans.

c.They are sensitive to penicillin.
d.Their Gram reaction is due to the outer membrane.
e.They protect the cell in a hypotonic environment.

13.Which of the following is not a structure found in prokaryotic cells? a.Flagella
b.Peritrichous flagella
c.Axial filament
d.Pili
e.Cilia

Figure 4.1

14.In Figure 4.1, which drawing is a tetrad?
a.Drawing a
b.Drawing b
c.Drawing c
d.Drawing d
e.Drawing e
f.Drawing f

15.In Figure 4.1, which drawing possesses an axial filament? a.Drawing a
b.Drawing b
c.Drawing c
d.Drawing d
e.Drawing e
f.Drawing f

16.In Figure 4.1, which drawing illustrates streptococci?
a.Drawing a
b.Drawing b
c.Drawing c
d....
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