Post-test 4

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created 7 years ago by jmata12
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Microbiology
Chapter 4
microbilogy 205 fall 2012
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1

Consider a gram-positive cell in a hypertonic medium. If the peptidoglycan were damaged, the cell would

plasmolyze OR ---> (shrink,collapse)

2

The motility of bacteria with flagella occurs through a series of "runs" and

"tumbles"

3

The term describing bacteria with flagella distributed over the entire surface of the cell is________. When essential nutrients are depleted, some strains of bacteria form, dormant structures that form within cells.

Peritrichous Endospores

4

Many pathogenic (disease-producing) bacteria have ______ that protect them from phagocytosis by host cells.

Glycocalyx OR capsules

5

Endoplamsic reticulum that has ribosomes attached to its outer surface is reffered to as

rough endoplasmic reticulum OR rough ER

6

Chemotaxis refers to the ability of microorganisms to

move toward or away from chemical stimuli

7

All of the following are found in the cell walls of gram-positive bacteria except

lipid A

8

Gram-negative cells contain a periplasmic space that is

rich in degradative enzymes

9

All of the following are true of the gram-negative outer membrane except

it contains enzymes for energy synthesis

10

A population of bacterial cells has been placed in a very nutrient-poor environment with extremely low concentrations of sugars and amino acids. Which kind of membrane transport becomes a crucial in this environment?

Active transport

11

Spherical shaped bacteria that divide and remain attached in chainlike patterns are called

streptoccoci

12

Which of the following about a gram-negative cell wall is not true?

It has teichoic acids.

13

Which of the following processes requires energy?

Active transport

14

Which of the following bacterial structures are necassary for chemotaxis?

Flagella

15

Which of the following statements is true?

Endospores are extremely durable structures that can be survive high temperatures.

16

The plane in which a bacterial cell that divides determines the arrangement of cells.

True

17

The cell membrane is a fluid structure that allows membrane proteins to move freely.

True

18

Acid-fast bacteria demonstrate unique staining properties because of a special protein layer found in their cell walls.

False

19

Penicillin is more effective against gram-negative bacteria than gram-positive bacteria because it specifically interferes with the synthesis of lipopolysaccharide.

False

20

The endosymbiotic theory states that eukaryotic organelles evolved from symbiotic prokaryotes living within other prokaryotes.

True.