The outer boundary of the cell is __________.
-
endoplasmic reticulum
-
golgi bodies
-
plasma membrane
-
cytoplasm
C
Correct answer
Explanation
The plasma membrane (also called cell membrane) forms the outer boundary of the cell, controlling what enters and exits. Endoplasmic reticulum (A) and golgi bodies (B) are internal organelles for protein synthesis and secretion. Cytoplasm (D) is the gel-like substance INSIDE the cell, not the boundary itself.