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What molecule could move through a phospholipid membrane with the least difficulty?
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∙ 10y ago
h2o
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∙ 11y ago
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What molecule has an important role in limiting what gets in and out of your cells?
The molecule that plays an important role in limiting what gets in and out of cells is the cell membrane. It is composed of a phospholipid bilayer that acts as a barrier, allowing only certain molecules to pass through. The cell membrane also contains various proteins and channels that further regulate the movement of substances across the membrane.
He characteristics that best describe the tail of a phospholipid molecule are .?
The most notable characteristic is amphipathicity, meaning it is hydrophilic on one end and hydrophobic on the other. This allows it to form a bilayer, of which cell membranes are made. If a molecule were to cross through the membrane, it would need to diffuse through a hydrophilic region, a hydrophobic region, and another hydrophilic region, which is difficult for most molecules. This is why the phospholipid bilayer is a good way to separate a cell from its environment.
What is the structure of plasma membrane?
The main structure of the plasma membrane is composed of the phospholipid bilayer. The phospholipid bilayer is composed of a spherical hypertonic head & a straight hypotonic tail which is designed to prevent the flow of unauthorized molecules & to maintain control of what enters & exits the cell. In order for a molecule to pass through, it must use one of multiple different methods of molecular transportation. The most common is the use of channel proteins. The molecule will travel through the channel protein based on its size & polarity-polar or non-polar.
Can you explain the structure and function of semipermeable membrane and phosolipid bilayer?
A cell membrane is composed of a double layer of phospholipids, more commonly referred to as a phospholipid bilayer, and each phospholipid itself is important to the structure and function of the cell membrane. The head of a phospholipid is hydrophilic, attracting water, the two tails are hydrophobic not attracted to water. This means that water can pass through the cell well by passive transport, as the hydrophilic heads draw the water towards them and the hydrophobic tails push the water through the membrane to the other side. The tails of the phospholipid also play an important function, as the chinks in the tail allow the membrane to be fluid and allow substances to pass through (if they do not require active transport).
What is the cell membrane which makes some substances can pass through it while others cannot?
The phospholipid bi-layer.
What molecule has an important role in limiting what gets in and out of your cells?
The molecule that plays an important role in limiting what gets in and out of cells is the cell membrane. It is composed of a phospholipid bilayer that acts as a barrier, allowing only certain molecules to pass through. The cell membrane also contains various proteins and channels that further regulate the movement of substances across the membrane.
Is a protein that forms an ion channel through a membrane is most likely to be a peripheral protein a trans membrane protein a phospholipid an enzyme or an entirely outside the phospholipid?
A protein that forms an ion channel through a membrane is most likely to be a transmembrane protein.
Does sugar diffuse through the cell membrane?
No. Only non-polar, small molecules can pass through a membrane by simple diffusion. A sucrose molecule is too large a molecule to pass through a membrane by simple diffusion, however, it can pass through a plasma membrane (but not any artificial membranes like Visking tubings) by facilitated diffusion, i.e. through transport proteins(specific carriers for sucrose) embedded in the membranes. ! =)
He characteristics that best describe the tail of a phospholipid molecule are .?
The most notable characteristic is amphipathicity, meaning it is hydrophilic on one end and hydrophobic on the other. This allows it to form a bilayer, of which cell membranes are made. If a molecule were to cross through the membrane, it would need to diffuse through a hydrophilic region, a hydrophobic region, and another hydrophilic region, which is difficult for most molecules. This is why the phospholipid bilayer is a good way to separate a cell from its environment.
What is the structure of plasma membrane?
The main structure of the plasma membrane is composed of the phospholipid bilayer. The phospholipid bilayer is composed of a spherical hypertonic head & a straight hypotonic tail which is designed to prevent the flow of unauthorized molecules & to maintain control of what enters & exits the cell. In order for a molecule to pass through, it must use one of multiple different methods of molecular transportation. The most common is the use of channel proteins. The molecule will travel through the channel protein based on its size & polarity-polar or non-polar.
What is a material that allows certain molecules to pass through it called?
The Plasma Membrane, which has a phospholipid bi-layer.
Why cant polar molecules and ions diffuse across the cell membrane?
Ions cannot diffuse through a phospholipid bilayer because they are not able to dissolve in lipids, hence the phosphoLIPID bilayer . Also, since they have an electrical charge, they are repelled by the membrane.
Can you explain the structure and function of semipermeable membrane and phosolipid bilayer?
A cell membrane is composed of a double layer of phospholipids, more commonly referred to as a phospholipid bilayer, and each phospholipid itself is important to the structure and function of the cell membrane. The head of a phospholipid is hydrophilic, attracting water, the two tails are hydrophobic not attracted to water. This means that water can pass through the cell well by passive transport, as the hydrophilic heads draw the water towards them and the hydrophobic tails push the water through the membrane to the other side. The tails of the phospholipid also play an important function, as the chinks in the tail allow the membrane to be fluid and allow substances to pass through (if they do not require active transport).
The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are?
non-polar
What is the cell membrane which makes some substances can pass through it while others cannot?
The phospholipid bi-layer.
What happens if a molecule is too large to go through a membrane?
The molecule will be transported across the membrane by way of a transport protein or protein channel.
How can water go through the cell membrane when it is polar?
Because it is a small molecule, water can diffuse through the cell membrane.
