Animal cell is limited by

A. Plasma membrane

B. Cell membrane

C. Basement membrane

D. Both a and b

A cell is the basic structural and functional unit of life. There are two main types of cells:

• Plant cell
• Animal cell

An organism with a single cell is called a unicellular organism. An organism with many cells is called a multicellular organism.

Plasma Membrane (Cell Membrane)

The plasma membrane is the outermost double-layer membrane of the animal cell. It protects the cell from the external environment and separates the interior of the cell from the outside world.

The membrane is made up of a lipid bilayer, with:

• Polar heads facing outward
• Hydrophobic tails facing inward
• It also contains proteins and carbohydrates.

Types of Proteins in Plasma Membrane

1. Integral proteins – embedded completely in the lipid bilayer.
2. Peripheral proteins – lie on the surface of the membrane.

Functions of Plasma Membrane

• Regulates the movement of substances in and out of the cell.
• Plays a role in cell signaling.

Answer: The correct option is D