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ra1l [238]
3 years ago
14

Which organelle forms the surface of a cell, separating its contents from the outside world PLEASE HELP

Biology
1 answer:
irinina [24]3 years ago
5 0
The Cell membrane. The cell membrane Is selectively permeable meaning that it allows certain substances such as water to get through but I can also block other substances that don’t belong in the cell to get into the cell
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Are the nitrogenous bases just free floating in the nucleus? If so..why are they just floating? And how are they made? Thank you
Veseljchak [2.6K]

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As you know, there are four nucleotides: Adenine, Thiamine, Cytosine, and Guanine. Adenine and guanine are purines, and cytosine and guanine are pyrimidines. You might not know what that means, so just in case purines are longer and pyrimidines are shorter. Therefore, A pairs with T and C with G. These pairings, along with other structural enzymes, build strands of DNA in the nucleus. I hope that helped, if you have more questions just let me know.

3 0
3 years ago
An increase in the volume of the alveoli would directly result in
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kumpel [21]

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