Answer:
The plasma membrane is selectively permeable
Explanation:
hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot. Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.
I chose the answer that said "Transition to socialist and communist government systems, and creation of labor unions."
A: several different codons can specify the same amino acid.