What kinds of molecules pass through a cell membrane most easily? What properties of the molecules and the membrane allow this to happen?

During the inhalation, we inhale the atmospheric air which contains not only the molecular oxygen but nitrogen and several other gases. In alveoli, oxygen has a greater concentration than it...

Kidney is not a reproductive organ, hence there is no germ cell or haploid cell in kidney. Cells in kidney are all diploid.

Take a look at a wiki article on the .

Molecules which are very small like Water and hydrophobic molecules easily pass through the .

Basic Definitions: = the semi-permeable structure that surrounds the cell and keeps all of the cells organelles from exploding everywhere. Cell Wall = the rigid 'armor' of the...

Phospholipid's structure consists of a polar head and two non polar tails. These tails do not allow polar molecules to pass in or out of the membrane. It does...

Simple diffusion happens down concentration gradient for small non polar and uncharged molecules, and for the lipid soluble ones. Facilitated happens also down concentration gradient but for polar or charged...

We know, the nucleus contains DNA,RNA and . Genetic material DNA is protected from cytoplasmic enzymes by encasing it inside nucleus.

These molecules are called phospholipids (2 fatty acid "tails" with a phosphate group "head"). They tend to form phospholipid bilayers because of the fact that the fatty acid "tails" are...

Polar molecules can have somewhat stronger intermolecular forces than non-polar molecules, but as liquids they can also flow through a membrane if the molecular size is small in comparison to...