Microbial Growth

Question 1

psychrophiles temp range?

Answer 1

-5C to 15C

Question 2

mesophiles temp range?

Answer 2

25C to 45C, those optimized to grow in the human body are between 35-40C

Question 3

Thermophiles temp range?

Answer 3

45C to 70C

Question 4

obligate aerobes

Answer 4

have absolute requirement for O2, use it to generate energy via aerobic respiration

Question 5

Obligate anaerobes

Answer 5

cannot multiply if O2 is present, but can also grow without it. Growth is better with O2 because aerobic respiration yields the most ATP

Question 6

microaerophiles

Answer 6

require small amount of O2 (2-10%) for aerobic respiration, higher concentration are inhibitory

Question 7

aerotolerant anaerobes

Answer 7

indifferent to O2, can grow in its presence but do not use it to transform energy, also called obligant fermenters

Question 8

what does superoxide dismutase convert?

Answer 8

Superoxide O2- to H2O2 and O2

Question 9

what does catalase convert?

Answer 9

H2O2 to H2O and O2

Question 10

neutrophiles range?

Answer 10

live and multiply from pH 5 to 8

Question 11

acidophiles range?

Answer 11

live and multiply at pH below 5.5

Question 12

alkalophile range?

Answer 12

live and multiply at or above pH 8.5

Question 13

name the bacteria type that are tolerant of high salt environment, up to 10%

Answer 13

osmotolerant

Question 14

name the bacteria type that require high levels of salt to live and multiply, more than 10%

Answer 14

halophiles