Chap. 4 Micro multiple choice

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1

Which of the following is not a distinguishing characteristic of prokaryotic cells?

they lack a plasma membrane

2

which statement best describes what happens when a gram positive bacterium is placed in distilled water and penicillin?

the cell will undergo osmotic lysis

3

Which statement best describes what happens when a gram negative bacterium is placed in distilled water and penicillin?

Water will move into the cell

4

Which statement best describes what happens when a gram-positive bacterium is placed in an aqueous solution of lysozyme and 10% sucrose?

No change will result: the solution is isotonic

5

Which of the following statements best describes what happens to a cell exposed to polymyxins that destroy phospholipids?

Intracellular contents will leak from the cell

6

Which of the following is false about fimbriae?

they may be used for motility

7

which of the following pairs is mismatched?

pili-reproduction

8

which of the following pairs is mismatched?

ribosomes-protein storage

9

You have isolated a motile, gram-positive cell with no visible nucleus. You can assume this cell has

ribosomes

10

The antibiotic amphothericin B disrupts plasma membranes by combining with sterols: it will affect all of the following cells except

gram-negative bacterial cells