Question

The outermost boundary of an animal cell is the -

• A. plasma membrane
• B. nucleus
• C. cytoplasm
• D. cytoskeleton

Answer 1

The correct option is A

plasma membrane

The correct option is A

Explanation of the correct option:

1. The plasma membrane is the common boundary between the cell and its environment in all cells.
2. It is the outermost covering of animal cells.
3. It is the elastic and semipermeable membrane and regulates what enters and exits the cell.
4. The cell wall forms the outermost boundary of plant cells.
5. It is composed a of phospholipid bilayer structure with embedded proteins.
6. The phospholipids organize themselves in a bilayer to hide or shield their hydrophobic tail regions and expose the hydrophilic head regions to water.

Explanation of the incorrect option:

Option B:

1. Eukaryotic cells have membrane-bounded cell organelles and a nucleus.
2. The Various Components of a nucleus in a eukaryotic cell: nucleus envelope, nuclear sap/ nucleoplasm, chromatin material, nucleolus, and nuclear pore.
3. Nuclear pore protein complexes act as a channel that helps in the transport of molecules from the nucleoplasm to outside the nucleus.
4. It is also involved in chromatin organization, gene expression regulation, and DNA repair.

Option C:

1. The fluid that fills up the cells is referred to as the cytoplasm.
2. It encompasses the cytosol with filaments, ions, proteins, macromolecular structures, and also other organelles suspended in the cytosol.

Option D:

1. The cytoskeleton is the structure that maintains the shape and internal organization of the cell and provides it mechanical support.

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