Growth Ch3

Question 1

The time range of bacteria generation

Answer 1

As little 20 mn (eschrchia coli)

As long 18 hr (mycobactrium tubricolosis)

Question 2

The 4 phases of growth curve?

Answer 2

1- lag phase : metabolic activity , bacteria grow not divide.
2-logarithmic phase: bacteria division : بنستغل المرحلة هذه في وضع الantibiotic , disrupting biosynthesis bacteria.
3-stationary phase: bacteria death equal to bacteria grow(steady state).
4-cell death

Question 3

Chemostal

Answer 3

Spicial apparatus for bacteria growth , bacteria not enter steady state just in logarithmic phase

Question 4

Obligate intracellular pathogens

Answer 4

Bacteria just lives in human cell to intake ِATP
1-anaplasma
2-ehrelichea
3-rickettsia
4-chlamydia

Question 5

Detoxify Enzymes when o2 is used?

Answer 5

1-speroxide dismotsse-convert o radical onto H2O2

2-catalase-convertH2O2 into water

Question 6

Obligate aerobes

Answer 6

M.tuberculosis

Require o to grow

Question 7

Facultative anaerobes

Answer 7

E.coli

USE O IF IT PRECENT OR Fermentation to synthesis ATP

Question 8

Obligate anaerobes

Answer 8

Clostridium tetani

Not grow in o they lack detoxify enzymes

Question 9

Beta-glactosidase in E.coli

Answer 9

Cleaved lactose into glucose and glactose

Question 10

Aerobic bacteria

Answer 10

Psedomonus aerginosa

Question 11

Siderophores (iron-binding compound)

Answer 11

Enterobactin

produced by bacteria E.coli and secreted to capture iron

Question 12

Bacteria are distinguish by fermintation of lactose

Answer 12

E.coli differentiated from shigella and salmonella

Question 13

Artificial media

Answer 13

Media for growing of pathogene

Question 14

Diffrentiated bacteria by fermitation of glucose or maltose

Answer 14

N.menigitis from n.gonorhoae