why does dna cannot pass through the cell membrane?

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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 may be bz of the higher conc. its nt persiable so... 

hope helps... 

thumbzupls?

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or get diifused ..so... 

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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. 


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.

Edit: After seeing how awful my attempted diagram was, I found you a better one:
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.


hope so this help u

thumbs up plzz

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thanks for ur ans

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hey friend-seeker!! im sorry.. but last time when i opened my account, ur profile opened... not once maybe 3-4 times....

do u hav any idea y???

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thank u frnds

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does DNA ever moves??? Do it has any flagella type thing?????? CS.......

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large size
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As cell membrane is semipermeable membrane and its size of pore is very small so that dna molecules are unable to pass through it as size of dna more than that of pores of cell membrane. So to overcome from this problem, means to increse the porocity (increse the size of pores) specific concentration of divalent cation(ex-Ca2+) is being treated.
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Because DNA is present in the nucleous and the cell membrane is outside the nucleous so it can not pass.
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because it is hydrophilic
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DNA being hydrophilic with the sugar-phosphate backbone, can not pass through the cell membrane. ... The nature of lipid is hydrophobic , so hydrophobic molecules can easily pass the membrane.
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Please find this answer

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Dna means , machine to transfer or provide message to cell of the body to form protein and is found to be inside the nucleus on chromosome to pass through dna becoz of membrane is too hard to enter it so biolistic gene gunof gold metal is being used to inject the piece of dna into host cell membrane
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DNA cannot pass through the cell membrane because it is hydrophobic in nature due to the presence of liquid bilayer.
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Nothing to say
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