CHAPTER 4 - Plasma Membrane & Transportation Process

Question 1

Means of CELL MEMBRANE

Answer 1

A complex structure that physically separates the interior of the cell from the extracellular environment.

Question 2

Function of Plasma Membrane?

Answer 2

Control traffic into and out of the cell.

Question 3

Characteristic of Plasma Membrane?
[2]

Answer 3

-Selective permeable -allowing some substance to cross more easily than others.
-contains a group of different proteins embedded in the fluid matrix of the lipid bilayer.

Question 4

Means of PHOSPHOLIPID?

Answer 4

Are the most abundant components of the cell membrane

Question 5

Structure of the Phospholipid?
[2]

Answer 5

-Hydrophilic head (polar)
-Hydrophobic tails (non-polar)

Question 6

Characteristic of Phospholipid?
[2]

Answer 6

• each molecule has phosphate-containing head and two fatty acid tails attached to a glycerol backbone

-called amphipathic molecules

Question 7

Physical environment created by phospholipid and proteins in membrane?

Answer 7

Fluid Mosaic Model

Question 8

Component of Fluid Mosaic Model
[2]

Answer 8

Mosaic:
consists of phospholipid and glycolipids (have fatty acid), sterols (no fatty acid) and proteins

Fluid:
motion and interactions of its components, which allow the membrane to remain very flexible

Question 9

Component of Membrane Structure?
[2]

Answer 9

-cell membrane:
semi permeable lipid bilayer found in all cells.

-contains:
biological molecules, primary proteins, lipids, carbohydrates which involved in cellular processes

Question 10

Function of MEMBRANE PROTEINS?
[6]

Answer 10

1) transporter
2) enzyme
3) cell surface receptor
4) cell surface identity marker
5) cell to cell adhesion
6) attachment to the cytoskeleton

Question 11

2 Types of Membrane Protein.

Answer 11

integral (intrinsic):
-embedded in the lipid bilayer
-spanning the membrane (also called transmembrane protein)

peripheral (extrinsic)
-not embedded in the lipid bilayer
-loosely bounded to the surface of other population of proteins

Question 12

5 types of Proteins?

Answer 12

1) Transport Proteins
2) Receptor Proteins
3) Recognition Proteins
4) Communication Proteins
5) Adhesion Proteins

Question 13

Means of Transport Proteins?

Answer 13

-as channel or transporter
-let specific molecule into and out of the cell / actively move molecules in one direction or others

Question 14

2 types of Transport Proteins

Answer 14

1) passive transport proteins
Movement of substances from high concentration to low concentration without using energy

2) active transport proteins
Movement of substances from low concentration to high concentration with energy in form ATP