Q. Read the following statements regarding archaebacteria and select the correct option I. Archaebacteria differs from other bacteria in having different cell wall structure II. Their cell wall is made up of cellulose and contains high amount of unsaturated fatty acid, which is responsible for their survival in extreme conditions III. Thermoacidophiles have dual ability to tolerate high temperature as well as high acidity
A) I and II are true
B) I and III are true
C) II and III are true
D) I, II and III are true
Explanation
Bacterial cell wall is made up of peptidoglycan, protein, non-cellulosic carbohydrates, lipids, amino acid, etc. Archaebacteria are characterised by the absence of peptidoglycan in their wall. Instead, the wall contains proteins and no-cellulosic polysaccharides. Thermoacidophiles have duel ability to tolerate high temperature as well as high acidity. They often live in hot sulphur springs, where the temperature may be as high as $80℃$ and pH as low as 2, $e.g.,$ Thermoplasma, Thermoproteus
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.