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Micro Bio Chp 11 Exam 2

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Microbiology Kingwood tx

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1

Pleomorphic bacteria

vary in size and shape

2

Which of the following bacterial arrangements is the result of snapping division?

palisades

3

The arrangement represented in the figure is typical of which of the following genera of bacteria?

Corynebacterium

4

What bacterial structure is responsible for separating the daughter DNA molecules after replication?

cytoplasmic membrane

5

Endospores

may be produced when nutrients are scarce.

6

Bergey's Manual of Systematic Bacteriology contains

classification schemes for prokaryotes

7

Which of the following characteristics distinguish the archaea from the bacteria?

cell wall composition, cytoplasmic membrane lipids, and 16S rRNA sequences

8

The archaea known as halophiles

are members of the Euryarchaeota and require salt concentrations above 9%

9

Low G + C content Gram-positive bacteria are

in the phylum Firmicutes and include Clostridia and Mycoplasma

10

Which of the following diseases is NOT associated with bacteria that form endospores?

toxic shock syndrome

11

Mycoplasmas are pleomorphic because they

have no cell walls

12

Which of the following bacterial genera produce endospores?

both Bacillus and Clostridium

13

Which of the following bacterial genera includes species that protect areas of the body such as the intestinal tract and the vagina from invasion by pathogens?

Lactobacillus

14

Which of the following groups of bacteria is named for its resemblance to fungi?

actinomyces

15

Which of the following bacterial genera is used for the degradation of environmental pollutants?

Nocardia

16

Which of the following is NOT associated with bacteria in the genus Streptomyces?

protection of plants against caterpillars

17

What feature of mycobacteria is responsible for the unusually slow growth of these bacteria?

The mycolic acid in their cell walls requires signification metabolic investment.

18

A large number of Gram-negative human pathogens are members of the

gammaproteobacteria

19

Members of which of the following genera are the most common sexually transmitted bacteria in the United States?

Chlamydia

20

A microbiologist observes what appears to be a pink-staining long rod within the periplasmic space of a Gram-negative bacillus. What is the structure likely to be?

Bdellovibrio

21

Which of the following statements regarding pseudomonads is FALSE?

They are symbiotic with plants for nitrogen fixation.

22

A flexible, spiral shaped bacterium is called a

spirochete

23

Which of the following statements regarding mycoplasmas is FALSE?

They stain Gram-positive

24

The anaerobic Clostridium species are troublesome pathogens largely because of their capacity for

endospore production

25

Gram negative facultative anaerobes that metabolize carbohydrates via glycolysis are members of the

gammaproteobacteria

26

A Gram-positive psychorotrophic rod _____ is a frequent contaminant of milk and meat and an opportunistic pathogen of the immunocompromised.

Listeria monocytogenes

27

A species of the genus Streptococcus is the leading cause of

"flesh-eating" bacterial infections.

28

The genus Mycobacterium includes species responsible for

tuberculosis

29

Members of the genus Chlamydia are

intracellular parasites

30

Pseudomona species are occasional causes of

urinary tract infections

31

The process by which a bacterial cell produces an endospore is called (endosporing/ sporulation/ vegetation).

sporulation

32

The most common form of reproduction among prokaryotes is (snapping/ budding/ binary)

binary

33

The rod-shaped (rickettsias/ chlamydias/ brucella) are intracellular parasitic members of the alphaproteobacteria.

rickettsias

34

Some members of the alphaproteobacteria produce a structure called a (prosthecae/ pilus/ filament) to produce extra surface area for nutrient absorption.

prosthecae

35

This bacterial shape is called (bacillus/ vibrio/ rod).

vibrio

36

The G + C content is an (RNA/ structural/ genetic) determination used in classifying the different taxa of Gram positive bacteria.

genetic

37

The (streptobacilli/ actinomycetes/ mycoplasmas) are a group of Gram-positive bacteria that form branching filaments resembling those of fungi.

actinomycetes

38

The Genus of pathogenic cocci responsible for a wide range of human disease and whose members grow in chains is (Staphylococcus/ Streptococcus/ Enterococcus).

Streptococcus

39

The members of the (alphaproteobacteria/ gammaproteobacteria/ actinomycetes) may alternate between a flagellated motile stage and a nonmotile stage attached by means of a prosthecae.

alphaproteobacteria

40

The reduction of nitrogen gas to ammonia is called nitrogen (fixation/ cycling).

fixation

41

Slow growing bacteria in the genus (Mycoplasma/ Mycobacterium) are able to withstand long exposure to air because of the presence of mycelic acid in their cell wall structure.

Mycobacterium

42

Plant tumors caused by Agrobacterium infections are called (galls/ heterocyst).

galls

43

The (bacilli/ Lactobacilli/ bacteroids) are a group of Gram-negative bacteria that include obligate anaerobes normally found in the intestinal tract of animals and humans.

bacteroids

44

The infective stage of chlamydia is called the (elementary/ initial) body.

elementary

45

Burkholderia is a common (true/ opportunistic) pathogen of patients with cystic fibrosis.

opportunistic


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