Question

The outermost boundary of an animal cell is called:

• A. Plasma membrane
• B. Nucleus
• C. Cytoplasm
• D. Cell wall

Answer 1

The correct option is A

Plasma membrane

The correct answer is option A.

Explanation of the correct option:

1. The plasma membrane is a biological membrane that shields the cell from its environment by separating the internality of all cells from the exterior environment (extracellular space).
2. It is the animal cells' outermost insulation because it is elastic, and its semipermeable feature helps control what enters and exits the cell.
3. The universal boundary between the cell and its surroundings is represented by the plasma membrane of all cells.

Explanation of the incorrect options:

Option B:

The nucleus is a membrane-bound organelle that houses the genetic material (DNA) of eukaryotic species.

Option C:

The cytoplasm is a thick liquid that fills each cell and is held in place by the cell membrane.

Option D:

Plant cells have a cell wall as their outermost barrier, not animal cells.

Final answer: The outermost boundary of an animal cell is called the plasma membrane.