the cell membrane present in all cells is made up of lipid bilayer and protiens. Since the cell DNA is hydrophilic or lypophobic, it cannot pass lipoid cel menm.
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First, DNA is located within the nucleus and they are not located in the cytoplasm due to the myriad enzymes which may damage the DNA (that's why DNA is translated into mRNA to protect the genetic information it contains).
Second, hydrophylic molecules cannot easily pass through the cell membranes, unlike hydrophobic molecules, is by virtue of the fact that the cell membrane is made of phospholipids and cholesterols which makes the abovementioned molecule impermeable. Large molecular weight and hydrophilic substances usually pass in channels, etc.
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The key words there are "lipid bilayer". Bi-layer. The polar tails aren't facing into the cell, exactly. The ones on the outside of the cell face in, and the ones on the inside of the cell face out. Edit: After seeing how awful my attempted diagram was, I found you a better one: hope so this help u thumbs up plzz
Diagram:
[OUTSIDE OF CELL]
oooooooooooooooooooooooooo lipid part of membrane layer 1
| | | | | | | | | | | | | | | | | | | | | | | | | | polar tail part of membrane layer 1
| | | | | | | | | | | | | | | | | | | | | | | | | | polar tail part of membrane layer 2
oooooooooooooooooooooooooo lipid part of membrane layer 2
[INSIDE OF CELL]
So you see, the DNA inside the cell bumps up against the lipid part of the membrane molecules, not the hydrophilic part.
http://virtuallyshocking.com/wp-content/…visit this site
You can see how the hydrophobic lipid part of the membrane protects the hydrophilic tails on both the inside and the outside of the cell.
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