Which scientists proposed the $Fluid-Mosaic$ model?

What is the 'pump' in the $Na^{+}-K^{+}$ pump?

Given below are two statements.
Statement-$I$: Cell wall is freely permeable.
Statement-$II$: Plasma membrane is selectively permeable.
Choose the correct answer from the options given below with reference to the structure of root hair.

The sodium-potassium pump is a .....

Where are phospholipids found?

Membrane proteins are held in the bilayer mainly by