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Which substances are able to cross the membrane, and what determines their ability to do so?
Certain substances, such as small molecules and ions, are able to cross the cell membrane. The ability of a substance to cross the membrane is determined by its size, charge, and solubility in the lipid bilayer of the membrane.
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
Because the ions are charged, indicating high polarity, which lipids do not possess; they're hydrophobic, and therefore ions cannot pass through the lipid bilayer since lipids are highly unpolar, unless through an ion channel, which has a higher polarity
What is the lipid bilayer impermeable to?
The lipid bilayer is impermeable to large polar molecules, such as ions and most proteins. It is also impermeable to water-soluble molecules that are not specifically transported across the membrane by proteins or channels.
What crosses lipid bilayers the slowest?
Large polar molecules and ions generally cross lipid bilayers the slowest due to their size and charge, which hinders their ability to move through the hydrophobic interior of the membrane. Additionally, molecules that are not lipid soluble or do not have specific transporters in the membrane will also have difficulty crossing the lipid bilayer.
Which of these are not embedded in the lipid bilayer at all?
Bacteria prokaryotic cells and eukaryotic.
Which solute is the least likely to cross a membrane by simple diffusion?
Large polar molecules and ions are the least likely to cross a membrane by simple diffusion due to their size and charge, which hinders their ability to pass through the hydrophobic lipid bilayer.
What is an important of the phospholipids in the cell membrane?
They can form a lipid bilayer. The lipid bilayer is the barrier that keeps ions, proteins and other molecules where they are needed and prevents them from diffusing into areas where they should not be.The phospholipids help the cell maintain its internal aqueous environment. (Apex)
Why do you think diffusion of ions through these channels is generally a slower process than diffusion through the lipid bilayer?
Nope. It Is diffusion
The plasma membrane is a bilayer of lipid molecules with protein molecues embedded True or False?
it depends on what you are referring to. the lipid bilayer is exactly what it says.it is two layers compsed of lipids. lipid molecules have two properties: a hydophobi tail and a hydrophilic head. so when the bi layer is put together, it has the tails facing eachter and the heads out to react with water conditions in the body. the membrane is also embedded with proteins of all dffierent kinds that allows ions to cross and this allows for cell communication
What does the lipid bilayer molecules do?
The lipid bilayer that forms the cellular membrane forms an effective semi-permeable membrane. The lipid bilayer typically can typically exclude larger molecules based on size (molecular weight) and other molecules based on charge (ions and salts).
How do fats cross the cell membrane?
Fats can cross the cell membrane through passive diffusion, facilitated diffusion, or by being transported with the help of carrier proteins. These methods allow fats to move across the lipid bilayer and enter the cell for various cellular processes.
Ionophores are small hydrophobic molecules that can partition into the lipid bilayer and increase their permeability to specific inorganic ions what is a channel forming ionophore?
A channel-forming ionophore is a type of ionophore that can create a pore or channel in the lipid bilayer of a cell membrane, allowing specific ions to pass through. These ionophores facilitate the movement of ions across the membrane by forming a pathway for ion transport. Examples include gramicidin and amphotericin B.
