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Why can't water pass through the phospholipids?
Water cannot pass through phospholipids because phospholipid molecules have hydrophobic tails that repel water molecules, preventing them from passing through the lipid bilayer.
Is glucose permeable through phospholipid bilayer?
No, glucose is not permeable through the phospholipid bilayer on its own because it is a polar molecule. It requires a specific transport protein, such as a glucose transporter, to facilitate its passage across the membrane.
What particles can diffuse directly through the lipid bi-layer?
As the bilayer contains hydrophobic fatty acid tails, water-soluble molecules cannot diffuse directly through. However, lipid soluble molecules such as oxygen can diffuse directly through. Overall, for a molecule to be able to diffuse directly through it must be lipid-soluble, relatively small and non-polar.
Can polar molecules and molecules that have chargers sneak through the nonpolar middle portion of the phospholipid bilayer?
Polar molecules and charged molecules generally cannot easily pass through the nonpolar middle portion of the phospholipid bilayer due to the hydrophobic nature of this region. Instead, they are typically transported across the membrane by specific transport proteins such as channels or carriers.
Do all substances pass freely between the intracellular and extracellular fluids through a phospholipid bilayer?
No, not all substances can pass freely through the phospholipid bilayer of a cell membrane. Small, non-polar molecules like oxygen and carbon dioxide can diffuse across easily, while larger molecules and charged ions require specialized transport mechanisms such as channels or carriers to move in and out of cells.
Water freely moves through a phospholipid bilayer Why is this unexpected?
It moves through the bilayer via channels. These channels often are for transfer through the bilayer for other chemicals (sodium, potassium, etc) but also allow water to flow through readily. It is unexpected because water is hydrophilic (obviously- all charged molecules are). The phosphate part of the bilayer can bind with water, but the lipid on the inside of the bilayer acts like a layer of oil on the surface of the water- water cannot pass through the hydrophobic lipid.
Why water molecules cannot diffuse directly through the phosolipids bilayer?
Water molecules are polar, while the interior of the lipid bilayer is nonpolar. This mismatch in polarity makes it energetically unfavorable for water molecules to pass through the hydrophobic interior of the lipid bilayer. Instead, water molecules move across cell membranes through specialized channels called aquaporins.
Why is it necessary for glucose to be pumped into the cell rather than diffusing in?
Glucose cannot pass through a phospholipid bilayer by simple diffusion.
What moves through a lipid bilayer slowly?
Polar molecules and ions move through a lipid bilayer slowly due to their hydrophilic nature, which makes it difficult for them to pass through the hydrophobic core of the bilayer. Additionally, large molecules, such as glucose, also experience slow diffusion as they cannot easily penetrate the lipid environment. This slow movement often requires the assistance of transport proteins to facilitate their passage across the membrane.
Why can't water pass through the phospholipids?
Water cannot pass through phospholipids because phospholipid molecules have hydrophobic tails that repel water molecules, preventing them from passing through the lipid bilayer.
Is glucose permeable through phospholipid bilayer?
No, glucose is not permeable through the phospholipid bilayer on its own because it is a polar molecule. It requires a specific transport protein, such as a glucose transporter, to facilitate its passage across 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
Passing an electric current through a certain substance produces oxygen and sulfur This substance cannot be a?
This substance cannot be water, because passing an electric current through water, in a process called electrolysis, produces hydrogen and oxygen gas, not oxygen and sulfur.
When you cannot see through a substance is called?
If you can't see through an object clearly it is an opaque object.
What substance cannot pass directly through the phospholipids of the plasma membrane?
Large polar molecules and charged molecules cannot pass directly through the phospholipids of the plasma membrane because the phospholipid bilayer is impermeable to them. Instead, these molecules rely on specific transport proteins like channels or carriers to facilitate their movement across the membrane.
What is the name for a substance that cannot be split into simpler substances?
An element is a substance that cannot be split into simpler substances through chemical means. It is composed of only one type of atom.
Can chlorine ions pass through the phospholipid bilayer of the plasma membrane?
Chlorine ions (Cl⁻) cannot easily pass through the phospholipid bilayer of the plasma membrane due to their charge and polarity. The hydrophobic interior of the bilayer acts as a barrier to charged particles. Instead, chlorine ions typically require specific ion channels or transport proteins to facilitate their movement across the membrane. These channels allow ions to bypass the lipid bilayer's hydrophobic core, enabling cellular processes that depend on ion transport.
