Question

question 4 1 pts how do polar compounds, such as amino acids, enter a cell?
○ without assistance
○ by dissolving into the lipid bilayer
○ thru hydrolysis
○ transported across membrane by proteins

Explanation:

Polar compounds like amino acids can't pass the non - polar lipid bilayer easily. They need membrane proteins (like transporters) to cross. “Without assistance” is wrong as polar molecules need help. “Dissolving into lipid bilayer” is wrong (lipid bilayer is non - polar). “Thru hydrolysis” is unrelated to membrane transport. So the correct mechanism is transport by proteins.

Answer:

transported across membrane by proteins