2. Cell membrane & Cellular transport – Dr. Fathy Emad

Cell Membrane

1 / 10

The phospholipid molecules in the cell membrane are formed of:

d) Heads directed inwards, facing each other.

a) Hydrophilic tails.

b) Polar charged heads.

c) Polar charged tails.

2 / 10

The cell membrane is specially stained with:

d) Iron hematoxylin.

c) Janus green.

a) PAS

b) Histochemical stain.

3 / 10

Phagocytosis is:

c) Engulfing of solid particles.

b) Uptake of molecules by binding to their receptors.

d) Invagination of cell membrane forming coated pits.

a) Engulfing of fluid droplets.

4 / 10

Regarding cell coat:

d) Formed of carbohydrates attached to lipids only.

b) Formed of phospholipid molecules arranged as lipid bilayer.

a) Present at cytoplasmic side of the cell membrane.

c) Concerned with attachment of cells to one another.

5 / 10

By LM, the cell membrane:

a) Can be seen with iron hematoxylin.

c) Difficult to be seen with H&E.

d) Is 7-10 um in thickness.

b) Can be stained with Janus green.

6 / 10

The organelles are:

d) Permanent structures.

b) Temporary structures.

a) Non-essential for vitality of the cell.

c) Non-living structures.

7 / 10

Concerning, the cell membrane:

b) Glycocalyx is present at cytoplasmic side.

a) Cholesterol molecules are present between heads of phospholipids molecules.

d) Transmembrane proteins are small proteins loosely attached to phospholipid bilayer.

c) Phospholipid molecules have hydrophilic heads.

8 / 10

Facilitated diffusion:

d) A process of engulfing solid particles by cell membrane.

b) Is carrier-mediated diffusion.

c) Needs energy.

a) Is movement of substances against concentration gradient.

9 / 10

Receptor-mediated endocytosis:

a) Needs a carrier.

c) Is movement of substances outside the cell.

b) A process of engulfing fluid droplets forming pinocytic vesicles.

d) Is a selective transport.

10 / 10

Transmembrane proteins:

b) Are small molecules acting as channels.

a) Extend across the cell membrane.

d) Present outside the lipid bilayer.

c) Loosely attached at both sides of the lipid bilayer.

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