Oh things like food, oxygen, ions, and even hormones.
yes plant cells needs a cell membrane
Yes, small hydrophobic molecules can cross the cell membrane.
Yes, nonpolar molecules can cross the cell membrane through simple diffusion.
There are two ions that can cross the cell membrane. The positively charged sodium and potassium ions can cross back and forth across the neuron cell membrane.
the cell membrane is like the skin of a cell. it keeps everything in that needs to be in and everything out that needs to be out.
Yes, polar molecules can cross the cell membrane through facilitated diffusion or active transport.
Yes, small polar molecules can cross the cell membrane through a process called passive diffusion.
It is the ability of the membrane to allow ions and/or particles to cross.
Intracellular
In order to enter the cytoplasm of a plant cell, a material would have to cross the plasma membrane and then the cell wall. The plasma membrane regulates what enters and exits the cell, while the cell wall provides structural support and protection.
Osmosis
Polarity