Question

Statement 1 : Almost all bacteria possess lipoproteinaceous plasma membrane.
Statement 2 : The plasma membrane of archaebacteria as well as eubacteria have same type of lipids.

• A. Both statements 1 and 2 are correct.
• B. Statement 1 is correct but statement 2 is incorrect.
• C. Statement 1 is incorrect but statement 2 is correct.
• D. Both statements 1 and 2 are incorrect.

Answer 1

Answer: (A)

Both statements 1 and 2 are correct.

• Bacteria are protected by a cell envelope composed of a rigid cell wall and a plasma membrane. The cell wall composed of disaccharides and amino acids gives bacteria structural support. Almost all bacteria possess a lipoproteinaceous plasma membrane that performs many functions, including transport, biosynthesis, and energy transduction.
• The plasma membrane of archaebacteria, as well as eubacteria, have the same type of lipids but differ in their bonding. Archea membrane lipids have ether bonds whereas bacteria have ester-linkages.
• Thus both the statements given above are correct.