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Do hydrophilic heads on plasma membranes attract or reple water?
Attract
Do some membranes have proteins with chanels that allow for the passage of hydrophilic substances?
true
What makes phospholipid membranes good at keeping some molecules out?
They have both hydrophilic and hydrophobic regions
Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes?
That would be phospholipids. They are a major component of the plasma membrane and contain hydrophilic, as well as, hydrophobic properties.
Is this true some membranes have proteins with channels or pores that allow for passage of hydrophilic substances?
yes it's true.
The compounds in biological membranes that form a barrier to the movement of hydrophilic materials across the membranes are?
lipids
Why Proteins do not pass through cell membranes?
Hydrophilic proteins.
Do hydrophilic heads on plasma membranes attract or reple water?
Attract
Do some membranes have proteins with chanels that allow for the passage of hydrophilic substances?
true
What makes phospholipid membranes good at keeping some molecules out?
They have both hydrophilic and hydrophobic regions
Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes?
That would be phospholipids. They are a major component of the plasma membrane and contain hydrophilic, as well as, hydrophobic properties.
Is this true some membranes have proteins with channels or pores that allow for passage of hydrophilic substances?
yes it's true.
How do the hydrophobic and hydrophilic properties of phospholipids help in maintaining the structure of the cell membrane?
Hydrophilic molecules are attracted to water. Hydrophobic molecules are not attracted to water, but they are attracted to each other. Phospholipid molecules are unusual because they are partly hydrophilic and partly hydrophobic. The phosphate head is hydrophilic and the two hydrocarbon tails are hydrophobic. In water, phospholipids form double layer with the hydrophilic heads in contact with water on both sides and the hydrophilic tails away from water in the centre. This arrangement is found in biological membranes. The attraction between the hydrophobic tails in the centre and between the hydrophilic heads and the surrounding water makes membranes veery stable.
What kind of lipid makes up the bilayer that forms cell membranes?
Phospholipids, where one end is hydrophobic and the other is hydrophilic.
Does hydrophilic substance have an easier time passing through membranes than do hydrophobic substance?
It has a harder time passing through. The inside of the membrane is hydrophobic, so something hydrophilic (water-loving), will not be liked by the hydrophobic (water-fearing) membrane.
What is a lipid with a water attracting and water repelling part of its molecule?
Any phospholipid has a hydrophilic head and hydrophobic tail. These are the lipids that are most common in cell membranes, which require this amphipathic property to function. Other lipids, including many sphingolipids, are also amphipathic.
What is meant by the phrase membranes are bifacial?
membrane are composed of a lipid bilayer. their hydrophobic tails face the inside of the membrane and their hydrophilic heads face their environment.
