2. Cell membrane & Cellular transport Dr. Fathy Emad

Cell Membrane

1 / 10

Concerning, the cell membrane:

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

c) Phospholipid molecules have hydrophilic heads.

b) Glycocalyx is present at cytoplasmic side.

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

2 / 10

By LM, the cell membrane:

a) Can be seen with iron hematoxylin.

c) Difficult to be seen with H&E.

b) Can be stained with Janus green.

d) Is 7-10 um in thickness.

3 / 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.

4 / 10

The phospholipid molecules in the cell membrane are formed of:

a) Hydrophilic tails.

b) Polar charged heads.

d) Heads directed inwards, facing each other.

c) Polar charged tails.

5 / 10

Receptor-mediated endocytosis:

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

a) Needs a carrier.

d) Is a selective transport.

c) Is movement of substances outside the cell.

6 / 10

The cell membrane is specially stained with:

d) Iron hematoxylin.

c) Janus green.

b) Histochemical stain.

a) PAS

7 / 10

Phagocytosis is:

b) Uptake of molecules by binding to their receptors.

c) Engulfing of solid particles.

a) Engulfing of fluid droplets.

d) Invagination of cell membrane forming coated pits.

8 / 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.

9 / 10

The organelles are:

c) Non-living structures.

d) Permanent structures.

a) Non-essential for vitality of the cell.

b) Temporary structures.

10 / 10

Transmembrane proteins:

d) Present outside the lipid bilayer.

b) Are small molecules acting as channels.

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

a) Extend across the cell membrane.

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