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What can across the membrane with assistance?
Large or polar molecules, such as glucose or ions, typically require assistance to cross the cell membrane. This assistance can come in the form of transport proteins like channel proteins or carrier proteins that facilitate the movement of these molecules across the membrane.
What makes phospholipid membranes good at keeping some molecules out?
Phospholipid membranes are selectively permeable due to their hydrophobic interior, which repels water-soluble molecules. This characteristic limits the entry of ions and large polar molecules into the cell, while allowing smaller, nonpolar molecules to pass through. Additionally, membrane proteins can facilitate the transport of specific molecules across the membrane.
Which part of the membrane would help a large protein molecule enter the cell?
globular proteins .
Which molecules will not diffuse directly across the lipid bi layer?
Large polar molecules such as proteins and glucose, as well as ions like sodium and potassium, will not diffuse directly across the lipid bilayer due to their size or charge. These molecules require specific transport proteins or channels to facilitate their movement across the membrane.
What substances normally fail to cross cell membranes under any circumstances?
Large molecules such as proteins and polysaccharides typically do not cross cell membranes. Additionally, charged ions like sodium (Na+) and chloride (Cl-) may have difficulty passing through cell membranes due to their charge.
What are proteins found in cell membranes that transport large molecules?
carrier molecules
What can across the membrane with assistance?
Large or polar molecules, such as glucose or ions, typically require assistance to cross the cell membrane. This assistance can come in the form of transport proteins like channel proteins or carrier proteins that facilitate the movement of these molecules across the membrane.
Facilitated diffusion moves large molecules through?
Facilitated diffusion moves large molecules through cell membranes with the help of specific carrier proteins. These proteins create channels in the membrane that allow large molecules to pass through and reach the inside of the cell. The process does not require energy input, as it relies on the concentration gradient of the molecules to drive their movement.
What makes phospholipid membranes good at keeping some molecules out?
Phospholipid membranes are selectively permeable due to their hydrophobic interior, which repels water-soluble molecules. This characteristic limits the entry of ions and large polar molecules into the cell, while allowing smaller, nonpolar molecules to pass through. Additionally, membrane proteins can facilitate the transport of specific molecules across the membrane.
Which part of the membrane would help a large protein molecule enter the cell?
globular proteins .
Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
What molecules during osmosis does not move across the membrane One example?
Large molecules such as proteins are typically unable to move across the membrane during osmosis. One example is starch molecules, which are too large to pass through the membrane pores.
What substances are too large for carrier proteins?
Large molecules such as proteins and polysaccharides are usually too large to be transported by carrier proteins. These molecules are often transported through other mechanisms like endocytosis or exocytosis.
What is it called when transport proteins to help large molecules like glucose across the cell membrane?
Facilitated diffusion is the process by which transport proteins help large molecules like glucose cross the cell membrane. These proteins create a channel or carrier mechanism that allows the molecule to move across the membrane along its concentration gradient.
What role do carrier proteins in facilitate diffusion?
it moves large molecules or molecules that are not soluble in lipids across across the cell membrane. (Pg. 101 in science book...1st para.)
Which molecules will not diffuse directly across the lipid bi layer?
Large polar molecules such as proteins and glucose, as well as ions like sodium and potassium, will not diffuse directly across the lipid bilayer due to their size or charge. These molecules require specific transport proteins or channels to facilitate their movement across the membrane.
What substances normally fail to cross cell membranes under any circumstances?
Large molecules such as proteins and polysaccharides typically do not cross cell membranes. Additionally, charged ions like sodium (Na+) and chloride (Cl-) may have difficulty passing through cell membranes due to their charge.
