Chapter 4

Question 1

Microbes that can live in the presence of O2 but don’t use it. “Propionibacterium shermonii” is an example (food bacterium)

Answer 1

Aerotolerant

Question 2

Requires higher CO2 concentrations than the normal atmosphere (.03%)

Answer 2

Capnophile

Question 3

Requires a small amount of O2 (only 5-10%). Higher concentrations are inhibitory.

Answer 3

Microaerophilic

Question 4

Best grown if O2 is present, but will go without it. E. coli is an example (an intestinal bacterium)

Answer 4

Facultative anaerobe

Question 5

Obligate anaerobe example (found in swamps)

Answer 5

Methanogens

Question 6

Bacteria that grow within -5-30C, often found in the Arctic

Answer 6

Psychrophiles

Question 7

Bacteria that grow within 20-30C, involved with food spoilage

Answer 7

Psychrotrophs

Question 8

Bacteria that grow within 25-45C, often causing human diseases (human temp is at 37C)

Answer 8

Mesophiles

Question 9

Bacteria found in compost heaps and hot springs, temps ranging from 45-70C

Answer 9

Thermophiles

Question 10

E. coli is which type of temperature growth bacteria? (grows in the human body temp)

Answer 10

mesophiles

Question 11

Toxic forms of oxygen need to be neutralized by enzymes known as__________. All bacteria that live in an oxygen environment have this.

Answer 11

Superoxide dismutase (SOD)

Question 12

Classification: Sunlight (energy) + CO2 (carbon)

Answer 12

Photoautotrophs

Question 13

Classification: Sunlight (energy) + organic compound (carbon)

Answer 13

Photoheterotroph

Question 14

Classification: Inorganic compounds (energy) + CO2 (carbon)

Answer 14

Chemolithoautotroph

Question 15

Classification: Organic compounds (energy) + organic compounds (carbon)

Answer 15

Chemoorganoheterotroph