Question 4 (1 point) Four components of cell membranes are listed below. Match e

Question

Question 4 (1 point) Four components of cell membranes are listed below. Match each one with the function it carries out in the membrane. BE CAREFUL: the options will re-arrange themselves each time you access the web work. Make the cell membrane a barrier against all but the smallest, uncharged molecules Provide channels for transporting larger or charged 1. Oligosaccharides 2. Phosphoglycerides 3. Proteins 4. Cholesterol molecules across membranes Receptors on the outside of the cell. Moderates the flexibility of the membrane. Save

Explanation / Answer

1) phosphoglycerides-

function- makes the cell membrane a barrier against all but smallest uncharged molecules

Explanation: The lipids are phosphoglycerides that is amphiphatic in nature due to its hydrophobic tail(fatty acid chain) lying in the interior of membrane ,while the polar (hydrophillic phosphate groups) head lies outside thereby forming a lipid bilayer .This lipid bilayer forms a barrier between two aqueous phases,thus only smallest uncharged species could pass through them due to their incredibly small size .

2) Proteins

Function:Provide channels for transporting larger or charged molecules across the membrane

Explanation: All carrier proteins and many ion channel proteins allow larger or charged molecules across the membrane .There are specific channel proteins that allows ions like K+,Na+ ,Ca2+ to pass through them (selective transport)

3)Oligosaccharides

Function:Receptors on the outside of the cell

Lipids molecules that are bound to Oligosaccharides are called glycolipids that are present in phospholipid bilayer and acts as receptors.Its head acts as binding site for receptor activity in the membrane

4)Cholesterol-moderates the flexibility of membrane

Cholesterol are embedded on the phospholipid bilayer with its polar hydroxy group aligned along the polar head of the phospholipid in animal cells

At high temperatures it interferes with fatty acid chains, preventing it from freezing thereby maintaining the flexibility of the membrane.However, at high temperature it reduces the membrane flexibility reducing the passage of small molecules

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