Bacteria Growth

Question 1

Saprophytic bacteria is ……..

Answer 1

Autotrophs bacteria

Question 2

Autotrophic bacteria classified in to …..

Answer 2

Phototrophs, chemotrophs

Question 3

Heterotrophic bacteria require….

Answer 3

Complex organic substances

Question 4

All bacteria of medical importance are …….

Answer 4

Heterotrophs

Question 5

Heterotrophs can growth in simple media contan………

Answer 5

Peptone or meat extract

Question 6

Media that contain blood or serum are called ……….

Answer 6

Enriched media

Question 7

What’s growth factors?

Answer 7

Is substances which they can not synthesis (vitamins,aminoacd ,purines , pyrimidines).

Question 8

……..are obligate aerobes bacteria

Answer 8

Mycobacterium tuberculosis ,
Pseudomona aeruginosa

Question 9

In presence of O2 tow toxic molecules are produced ………,……

Answer 9

Superoxide ion , hydrogen peroxide

Question 10

What are enzymes that relese by aerobic bacteria ?

Answer 10

Superoxide dismutase ,catalase

Question 11

Clostridium tetani ,bacteroides fragilis are ………. bacteria

Answer 11

Anaerobic

Question 12

Whay anaerobic bacteria can’t growth in presence of O2?

Answer 12

Because it can’t release enzymes catalase and superoxide dismutase that break down toxic molecules

Question 13

…………..Required low O2 tension for growth

Answer 13

Micro aerophilic bacteria

Question 14

Campylobacter jejuni are …….

Answer 14

Micro aerophilic bacteria

Question 15

Whay Micro aerophilic bacteria release low superoxide dismutase and catalase?

Answer 15

Because it growth in low tension of O2

Question 16

What pattern of metabolism in aerotolerant anaerobes?

Answer 16

Fermentative anaerobic

Question 17

What reason aerotolerant anaerobic bacteria tolerante in presence of O2?

Answer 17

Because it have superoxide dismutase

Question 18

Example of aerotolerant anaerobic bacteria is ……..

Answer 18

Cl.Perfrinens

Question 19

Capnophilic are bacteria that require high concentration of CO2 ex ……

Answer 19

Pathogenic Neisseria and Brucella abortus

Question 20

What range of temperature for growth medical importance bacteria?

Answer 20

25 ,40 c

Question 21

What is optimum temperature for growth medical importance bacteria?

Answer 21

37 the normal body temperature

Question 22

What is temperature for growth non pathological bacteria?

Answer 22

Lower than 20 or higher than 55

Question 23

What is optimum temperature?

Answer 23

The temperature wher the growth occurs best

Question 24

What is bacteria that cause spoilage of refrigerated food ?

Answer 24

Psychrophilic

Question 25

Whay thermophilic bacteria resistance high temperature?

Answer 25

Because it have spores

Question 26

What is bacteria causing spoilage underprocessed canned food ?

Answer 26

Thermophilic bacteria Ex Geobacillus stearothermophilus

Question 27

What PH value for most pathological bacteria?

Answer 27

7.2_7.6 ph

Question 28

What is bacterum growth in alkaline ph?

Answer 28

Vibirio cholerae

Question 29

What is ph for growth lactobacili ?

Answer 29

Acidic ph at 4

Question 30

What happened in Lag phase ?

Answer 30

1 adaptation with active macro molecular 2 increase in size of the cell without increase in cell number

Question 31

What is fermentation?

Answer 31

Breakdown of sugar to pyruvic acid or lactic acid