The most improved model of the structure of the cell membrane is

(1)Fluid membrane model

(2)Fluid mosaic model

(3)Sandwich model

(4)unit membrane model

Lateral movement of which of the following biomolecules takes place within the overall bilayer

(1)lipids

(2)carbohydrates

(3)proteins

(4)Both A and C

The ability to move within the membrane is measured as its

(1)liquidity

(2)fluidity

(3)viscosity

(4)stability

The fluid nature of the membrane is also important from the point of view of functions like

(1)cell growth

(2)secretion

(3)cell division

(4)All of the above

The most important function of plasma membrane is the

(1) transportation of molecules across it

(2)cell division

(3)cell growth

(4)endocytosis

The movement of molecules with and without requirement of energy are called as

(1)active and passive respectively

(2)passive and active respectively

(3)uphill and downhill respectively

(4)Both A and C

In membranes carrier proteins are required for

(1)nonpolar molecules

(2)polar molecules

(3)charged molecules

(4)Both B and C

The movement of water across membranes is from

(1)higher to lower concentration of water

(2)lower to higher concentration water

(3)outside of the cell to its inside

(4)Both A and C

The transport of sodium and potassium ions through the membranes is an example of

(1)transport against the concentration gradient

(2)active process

(3)passive process

(4)Both A and B

In which of the following processes the movement of substance takes place along the concentration gradient

(1)Diffusion

(2)Osmosis

(3)Active transport

(4)Both A and B