Answer:
selectively permeable
Explanation:
cell memebranes conteol the flow of butrients in and out of the cell, this meaning that they can keep some out of the cell. they SELECT what goes in and out.
What portion of a pre-mRNA molecule may be cut to be discarded?
ans:- In eukaryote cells the primary transcript (pre-mRNA) is processed. One or more sequences (introns) are cut out.
I would answer but you didn't put any pictures so I can't see what shows anything.