SHARING SESSION DR SYARIFAH

Production of secondary metabolite happens during

• Lag phase

• Log phase

• Stationary phase

• Death phase

Factors affecting bacterial growth are:

• temperature

• pH

• osmotic pressure

• water activity

E. coli can grow at temperatures in the range of 14 to 45 degrees. Thus, E. coli is a_______

• thermophilic bacterium

• mesophilic bacterium

• psychrophilic bacterium

• extreme thermophile bacterium

Choose which of the following is halotolerant bacteria.

• Staphylococcus aureus

• Escherichia coli

• Halobacterium salinarum

• Vibrio fischeri

How bacteria survive under harsh environment?

• Biofilm formation

• Spore formation

• Accumulation of solute

• Secretion of enzymes

Choose the correct statement regarding "obligate aerobe"

• able to survive in the presence or absence of oxygen

• require low level of oxygen

• oxygen inhibits bacterial growth

• require oxygen

Vibrio fisheri is an example of _____

• Microaerophile bacterium

• extreme halophile bacterium

• barotolerant bacterium

• acidophile bacterium

Define osmophilic bacteria.

• bacteria grow at low oxygen concentration

• bacteria grow in the presence of high sugar concentration

• bacteria grow in dehydrated environments

• bacteria grow in the presence of low sugar concentration

Microbial healthiest state is referring to _______

• Lag phase

• Log phase

• Stationary phase

• Death phase

Neutrophile are bacteria that grow at _______

• 2.5 to 5.2 M NaCl

• pH 5.5 to 8.5

• pressure 500 atm

• temperature 66 to 105 degrees