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Do water molecules passively enter and leave cells through the plasma membrane?
Wiki User
∙ 12y ago
Yes, the direction of the flow depends on the contentration of water on the out side and the inside of the cell's membrane.
Wiki User
∙ 12y ago
Wiki User
∙ 8y agoWater can be considered to "dissolve" into the membrane lipids, then diffuse across the membrane and come out of "solution". This can of course happen in either direction.
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Which of these extracellular signal molecules could diffuse through a plasma membrane and bind to an intracellular receptor?
estrogen
Which structure regulates passage of molecules into and out of cells?
The cell membrane is a membrane separating the inside of the cell from the outside environment. This structure is also known as the plasma membrane or the cytoplasmic membrane.
What are three materials that move through a cell membrane?
Sodium, potassium and calcium are the three things that move through the plasma membrane. There are many other molecules and ions that do move through cell membrane. Plasma membrane have a selective permeable property.
The plasma membrane is a semipermeable membrane. This means that it is?
it is permeable to some molecules and not permeable to others.
What are chemical messengers that pass through the plasma membrane of cells and have receptor molecules in the cytoplasm?
mitochondria
What substance is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
Lipid-soluble molecules such as O2 and CO2 diffuse freely through the plasma membrane.
What type of molecules embebbed in the plasma membrane allows molecules to pass through the membrane by active or passive transport?
proteins
Which molecules difuse through the lipid portion of the plasma membrane?
Only nonpolar (hydrophobic) molecules can pass through the bi-lipid membrane. For example, hormones are nonpolar, and they can pass through the membrane.
What is a holes in plasma membrane through which molecules pass across capillary wall?
The plasma membrane is made up of a lipid bilayer and some proteins. The transmembrane proteins are the structures which are involved in the transport of molecules in or through the cell.
What molecules passively diffuse across the plasma membrane?
Diffusion is a type of passive transport but the answer I think you are looking for is this: water, gasses(N,O2,CO2...), and ions(K+, Na+...)
What molecules would be most likely to pass through the lipid bilyer of a plasma membrane?
ions and polar molecules
Do Hydrophobic molecules pass through the fatty-acid region of the plasma membrane easily?
no
What types of molecules have difficulty crossing the plasma membrane?
Large, polar, uncharged molecules cannot pass through a membrane without the help of protein channels embedded into the plasma membrane. Ions also have difficulty passing; they need ATPs.
What method carries molecules and pump molecules or form channels through which specific molecules pass across the plasma membrane?
Transport mechanisms
Why do most substances have to be assisted through the plasma membrane?
The plasma membrane is made from tightlypack phospholipids. The plasma membrane prevents polar molecules and large molecules from diffusing freely. Fatty (lipophilic) molecules can easily pass through. since cells often need water soluble materials such as water and sugars, transporters and pores need to be made out of proteins to let those molecules through. One of the most important pumps is the Na+/K+ ATPase pump which maintains gradients of sodium and potassium across the cell membrane
Osmosis can only if water travels through what?
Water molecules travel through the plasma membrane, tonoplast membrane. In biological systems, the solvent is typically water.
What is a material that allows certain molecules to pass through it called?
The Plasma Membrane, which has a phospholipid bi-layer.
