Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of

the following statements is correct with respect to the movement of lipids and proteins

from one lipid monolayer to the other (described as flip-flop movement)?

1. Both lipids and proteins can flip-flop

2. While lipids can rarely flip-flop, proteins cannot

3. While proteins can flip-flop, lipids cannot

4. Neither lipids, nor proteins can flip-flop

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

(1) They are absent in animal cells.

(2) They act as channel proteins.

(3) They are absent in plant cells.

(4) They are only externally located

Fluid mosaic model of plasma membrane was given by

1. Robertson

2. Robert Hooke

3. Singer and Nicholson

4. Gorter and Grendel

The detailed structure of the cell membrane was studied only after the advent of the

(1)compound microscope

(2)cryo-electron microscopy

(3)X-ray crystallography

(4)electron microscope

The lipid component of the membrane mainly consists of

(1)phosphoglycerides

(2)triglycerides

(3)monoglycerides

(4)Both B and C

Integral or Peripheral proteins classification is based on

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