question_answer 25)

  Which of the following statement is not true for plasma membrane? (a) It is present in both plant and animal cell (b) Lipid is present as a bilayer in it (c) Proteins are present integrated as well as loosely associated with the lipid bilayer (d) Carbohydrate is never found in it

Answer:

                  (d) Statement is false. Carbohydrates are never found in plasma membrane is not true. The biochemicalinvestigation done on cell ^membrane clearly demonstrate that the cell membranepossess protein and carbohydrates as biochemical components. The other options stand true for plasma membrane Plasma membrane is present in both plant and animal cells. Lipid is present as a bilayerand lipid component is made of phosphoglycerides (fluid mosaic model by Singer andNicolson). Proteins are present integrated as well as loosely associated with the lipid bilayer. Theratio of protein and lipid varies considerably in different cell types.