Question

Why cell membrane is called selectively permeable membrane?

Answer 1

Answer:

Explanation:

Plasma membrane is selectively permeable membrane because it allows only some substances (Water and some Solutes) and blocks some substances (solvent particles) into the cell........

The Phospho Lipid Bi-Layer is useful in this property of Plasma Membrane....

This layer has Hydrophilic head on the outsides and Hydrophobic tails on the insides and arranged in two layers. This arrangements helps in this property.........

HOPE IT HELPS!!!

BY_BIO_LOVER!!!

Answer 2

Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds. These regions are extremely cold (temperature about 10 to 20K, just above absolute zero). At these temperatures, gases become molecular meaning that atoms bind together. CO and H2 are the most common molecules in interstellar gas clouds. The deep cold also causes the gas to clump to high densities. When the density reaches a certain point, stars form.