In the given figure,what does $B$ represent?

Keeping in view the 'fluid mosaic model' for the structure of the cell membrane,which one of the following statements is correct with respect to the movements of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?

The Nobel Prize of $1991$ for discovering single ion channels in cells was awarded to:

The cell envelope is a chemically complex structure consisting of a tightly bound three-layered structure. Which layer is semi-permeable in nature?

Which concept was proposed by the scientist Robertson?

What is the nature of the association between proteins and lipids in the cell membrane?