Ions, molecules and RNA cross that boundary through structures called:
APores
BPumps
CPoles
DPouches
Answer & Solution
Correct answer: A. Pores
1. The envelope is not sealed shut.
2. Openings control what passes in and out.
3. Those openings are pores.
_Source: OpenStax Concepts of Biology, Chapter 3, Cell Structure and Function._
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