Question

CRITCA HINKING A scientist describes an organism as a chemoheterotrophic, aerotolerant, mesophilic, facultatively halophilic coccus. Describe the cell's metabolic and structural features in plain English. 1.

Answer 1

Chemoheterotrophic means they obtain their energy from chemical, they cannot synthesise their food from inorganic carbon.

Aerotolerant means they grow in absence of oxygen but can tolerate oxygen presence. these organisms have superoxide dismutase and peroxidase

mesophilic means the bacteria that can grow on moderate temperature ranging from 20 to 45-degree celsius

facultative halophilic means an organism that lives on the high salt concentration but they can also grow on the low salt concentration

Coccus means round shape.

2- given that the generation time of bacteria is 30 minutes and its lag phase last for 1 h.

So at the end of 2 hr, it will complete two generations.

So total bacteria at the end of 2 hr will be 40.

At the end of 7 hr, they will complete 12 generation.

(7-1)*2 = 12

total number of bacteria can be calculated using the number of bacteria *2ⁿ

n = number of generation

10*2¹²

10*4096 = 40960 bacteria