CO2, H2O, and O2 can all diffuse across a cell membrane. Also, small polar molecules (uncharged) and hydrocarbons easily diffuse across.
ions and cytoplasm
amino acids and gluctose
oxygen
Yes, how else would our cells obtain oxygen?
H2O CO2 O2 hope this helps
Facilitated diffusion is a type of diffusion specifically for larger molecules, to help them cross a selectively permeable membrane with the help of integral proteins that act as carriers. Facilitated diffusion is a passive process, i.e. it does not need energy/ATP.
Things that aren't charged. Charged particles can't cross the hydrophobic tails, but are attracted to the outward-facing hydrophilic phosphate heads. Things that are charged can still diffuse into the cell, but it must be facilitated by proteins present within the cell membrane.Oxygen and carbon dioxide are some examples of things that can freely diffuse across the cell membrane, water and ions are some example of things that must be facilitated by protein channels.
No, the membrane is known as semi-permeable because some substances (such as water) can pass freely through - whereas others (such as ions) cannot.
Yes, how else would our cells obtain oxygen?
Water molecules freely diffuse across a semipermeable membrane.
the solubility theory of membrane permeability simply describes that a membrane can only be freely permeable to substances that can dissolve in it. this was the most basic theory posed to explain how substances passed through membranes of cells. another way of explaining this is that substances that can freely or passively diffuse across membranes when they have the same chemical or physical properties as the membrane.
magnets
Lipid-soluble molecules such as O2 and CO2 diffuse freely through the plasma membrane.
glucose
H2O CO2 O2 hope this helps
selective permeability
Substances that can freely pass through the plasma membrane must be small and non-polar.
protiens
Yes, peroxisomes have their own membrane. The membrane helps to keep the enzymes within the organelle from interacting freely with the other intracellular substances.
Facilitated diffusion is a type of diffusion specifically for larger molecules, to help them cross a selectively permeable membrane with the help of integral proteins that act as carriers. Facilitated diffusion is a passive process, i.e. it does not need energy/ATP.