Question

1. which structure regulates what enters and leaves the cell?

a. nucleus
b. cytoplasm
c. cell membrane
d. cell wall

Explanation:

To solve this, we analyze each option:

• Option a: The nucleus contains genetic material and controls cell activities, not regulating entry/exit.
• Option b: Cytoplasm is the fluid inside the cell where organelles are, not for regulation.
• Option c: The cell membrane (plasma membrane) is selectively permeable, controlling what enters and leaves the cell.
• Option d: The cell wall (in plant/fungal cells) provides structure and protection, not selective regulation.

Answer:

c. cell membrane