Microbial growth

Question 1

Psychrophiles

Answer 1

Cold loving microbes.

they grow in cold weather

Question 2

Mesophiles

Answer 2

Bacteria that grow in moderate temperatures

(20 to 50 deg C)

Question 3

Thermophiles

Answer 3

Heat loving bacteria

50+ deg Cel

Question 4

Acidophiles

Answer 4

bacteria that like a low pH (4 or less)

like acidic conditions

Question 5

Akalineophiles

Answer 5

Bacteria that grow in basic conditions ph9 or more

Question 6

Halophiles

Answer 6

bacteria that can grow in salty envt

Question 7

Osmotolarent

Answer 7

Can service salty conditions

Staphylococcus aureus is an example…we have salty skin it survives

Question 8

Fastidious

Answer 8

These are picky bacteria. They are hard to grow becuase they are picky about conditions. If not right they won’t grow.

Question 9

Obliged aerobes/areobes

Answer 9

• Require oxygen
• Mycobacterium tuberculosis (infect lungs)
• Pseudomonas auregenosa (this is an opertuneistic bacteria)

Question 10

Facultative anaerobes

Answer 10

• grow aerobic and anarobicly
• Whichever allows more energy to be produced
• often gut MO’s
• E. coli,
• Proteus sp.

Question 11

Anaerobes

Answer 11

• Can only service with little to no oxygen present
• Clostridium sp. is one example

Question 12

Aerotolerent anaerobes

Answer 12

• ^{only anarobicly matabalism}
• ^{can service when oxygen is present}
• streptococcus pyogenes is an example

Question 13

Microareophiles

Answer 13

arobic growth but at lower levels of O₂

normally requires increase CO₂

found in stomach, vaginal areas, spinal column

Neisseria meningiditis, Neisseria ghonaria

Question 14

Capnophiles

Question 15

Barophiles

Answer 15

Bacteria that can withstand high barometric pressure

Question 16

Generation time

Answer 16

• You the time required for a cell to grow and divide into two.
• The doubling time

Question 17

Lag phase of growth

Answer 17

• Number of cells stays the same
• intense metabolic activity
• absorbing nutrients
• replicating DNA

Question 18

Log phase of growth

Answer 18

• Log growth or exponential growth of cells
• Most active metabolically = most sensitive to drugs/antibiotics

Question 19

Stationary phase of growth

Answer 19

• growth rate slows and some bacteria die
• equal amount of growth and death
• equilibrium

Question 20

Death phase of growth

Answer 20

• number of deaths more than growth
• bacteria are least susseptable to drugs now