Destroyer Bio #279

[d wannabe]

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Can someone clarify this?

b) says that Introns are DNA bases which can be found btw exons, but are not transcribed.

But I thought that introns are transcribed but during post-transcriptional processing, they are removed before translation.
shouldn't that be "but are not translated"?



And one more question:
During Resting potential, is the membrane permeable to Na+?
I thought few Na+ can still go INSIDE, but I read somewhere that it is impermeable to Na+.

HELP

 

[ZenoVT]

I am pretty sure introns are transcribed too.

 

[Xtian]

You've got good eyes, I totally missed that...

In the cell nucleus, the DNA that includes all the exons and introns of the gene is first transcribed into a complementary RNA copy called "nuclear RNA," or nRNA. In a second step, introns are removed from nRNA by a process called RNA splicing. The edited sequence is called "messenger RNA," or mRNA.

 

[tuthluver]

If I remember correctly....During resting potential only some of the proteins responsible for K+ are open. The proteins responsible to allow Na+ in are closed until an action potential occurs.

 

[d wannabe]

If I remember correctly....During resting potential only some of the proteins responsible for K+ are open. The proteins responsible to allow Na+ in are closed until an action potential occurs.

Thanks!

I'm always confused with the action potential.

So, 3Na+out/2 K+in (ACTIVE transport) would make "Resting" potential.

During Action potential, it would be voltage gated memebrane that allows Na+ in (depolization) and then later K+ out (repolarization)
Are they Passive transport?

 

[AndyK]

Thanks!

I'm always confused with the action potential.

So, 3Na+out/2 K+in (ACTIVE transport) would make "Resting" potential.

During Action potential, it would be voltage gated memebrane that allows Na+ in (depolization) and then later K+ out (repolarization)
Are they Passive transport?

Those protein channels move ions by facilitated diffusion.