ï»¿  Describe different types of membranes. from Biology Cell : The Unit of Life Class 11 Assam Board

### Chapter Chosen

Cell : The Unit of Life

### Book Store

Currently only available for.
CBSE Gujarat Board Haryana Board

### Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
Describe different types of membranes.

There are three types of membranes :

1. Permeable membranes. These membranes allow diffusion of both solvent and solute molecules or ions through them e.g. cell wall.

2. Impermeable membranes. These membranes prevent any substance to pass through it.

3. Semipermeable membranes. These types of membranes allow diffusion of  certain substances through it while prevent the others to pass through it. e.g. cell membrane.

162 Views

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann
1046 Views

Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.
1517 Views

What is the function of contractile vacuole in amoeba?

Excretion.
1170 Views

Â What are receptor molecules ?

Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell.Â When such chemical signals bind to a receptor, they cause some form of cellular response.Â
941 Views

State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not.Â
1562 Views