Answer: a. Bacillus subtilis is most the most resistant to high temperature .The endospore which is formed inside the cell wall and tough capsules which are formed help the bacillus to resist the high temperature, when bacillus is exposed to the high temperature the internal bonds present in the bacteria allow the protein chain to form a long chain-like structure when the spore is about to dehydrate.
explanation: Bacillus subtilis is a gram-positive bacteria and it is present in the soil and gastrointestinal of the human and ruminants. The shape of Bacillus subtilis is a rod, which helps in forming endospore which very tough and protective and it helps the Bacillus subtilis to resist very high temperature. The spore which is formed in the Bacillus subtilis helps them to tolerate heat and they can grow in the mesophilic temperature.Bacillus subtilis cell wall is made up of peptidoglycan, which helps to maintain the shape of the cell and help to tolerate the high turgor pressure.
