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

Cell Membrane

1 / 10

Phagocytosis is:

d) Invagination of cell membrane forming coated pits.

a) Engulfing of fluid droplets.

b) Uptake of molecules by binding to their receptors.

c) Engulfing of solid particles.

2 / 10

Receptor-mediated endocytosis:

a) Needs a carrier.

c) Is movement of substances outside the cell.

d) Is a selective transport.

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

3 / 10

Concerning, the cell membrane:

c) Phospholipid molecules have hydrophilic heads.

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

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

b) Glycocalyx is present at cytoplasmic side.

4 / 10

The organelles are:

a) Non-essential for vitality of the cell.

d) Permanent structures.

c) Non-living structures.

b) Temporary structures.

5 / 10

The phospholipid molecules in the cell membrane are formed of:

c) Polar charged tails.

d) Heads directed inwards, facing each other.

b) Polar charged heads.

a) Hydrophilic tails.

6 / 10

Transmembrane proteins:

a) Extend across the cell membrane.

d) Present outside the lipid bilayer.

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

b) Are small molecules acting as channels.

7 / 10

By LM, the cell membrane:

d) Is 7-10 um in thickness.

b) Can be stained with Janus green.

c) Difficult to be seen with H&E.

a) Can be seen with iron hematoxylin.

8 / 10

Regarding cell coat:

b) Formed of phospholipid molecules arranged as lipid bilayer.

d) Formed of carbohydrates attached to lipids only.

c) Concerned with attachment of cells to one another.

a) Present at cytoplasmic side of the cell membrane.

9 / 10

The cell membrane is specially stained with:

d) Iron hematoxylin.

b) Histochemical stain.

c) Janus green.

a) PAS

10 / 10

Facilitated diffusion:

c) Needs energy.

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

b) Is carrier-mediated diffusion.

a) Is movement of substances against concentration gradient.

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