Ph affects

Question 1

even if some microorganisms can live at very low or high PH the cell’s internal ?

Answer 1

remains near neutrality

Question 2

Organisms that grow optimally at a pH value in the range termed circumneutral (pH 5.5 to 7.9)

Answer 2

neutrophiles

Question 3

acidophiles

Answer 3

organisms that grow best below pH 5.5

Question 4

When the pH is raised to neutrality, for acidophiles?

Answer 4

destroyed and the cells lyse.

Question 5

acidophiles can’t just tolerate they?

Answer 5

they require for cytoplasmic membrane stability

Question 6

alkaliphiles

Answer 6

Microorganisms showing pH optima of 8 or higher

Question 7

alkaliphiles use what kind of pump?

Answer 7

NA+ , pcq pas bcp de H+ ds milieu alkalin

Question 8

Microbial life at extreme pH,Every microbe has a pH range

Answer 8

(2‐3 pH units) within which growth is possible

Question 9

Adaptation to low pH, Changes of the cytoplasmic membrane to require

Answer 9

high concentration of

protons for membrane stability.

Question 10

Adaptation to low pH,bacteria lyse?

Answer 10

t higher pH, because the

membrane becomes unstable.

Question 11

Adaptation to high pH,Changes of the cytoplasmic membrane to withstand

Answer 11

low concentration of

protons.

Question 12

Adaptation to high pH,who do they use pcq pas assez de H+?

Answer 12

Use of Na+ gradient for transport and motility (low concentration of protons
outside, pmf is hard to maintain).

Question 13

Adaptation to high pH,but how do they still make function the ATPase

Answer 13

Keep the electron transport chain close to the ATPase, so protons that are
pumped out do not diffuse away.

Question 14

What are added to laundry detergent

?

Answer 14

Proteases and lipases from alkaliphiles