Question

The function of lysosomal membrane is _________.

• A. It isolates an acidic environment for the lysosome's hydrolytic enzymes from the neutral pH of the cytoplasm.
• B. It is continuous with the nuclear membrane, thereby linking the lysosome with the endoplasmic reticulum.
• C. It is used as an alternative site of protein synthesis.
• D. The cytochrome carriers of the electron transport chain are embedded within it.
• E. It separates the nucleus from the cytoplasm.

Answer 1

Answer: (A)

It isolates an acidic environment for the lysosome's hydrolytic enzymes from the neutral pH of the cytoplasm.

The lysosomal membrane, which has a typical single phospholipid bilayer, controls the passage of material into and out of lysosomes, by its permeability and ability to fuse with digestive vacuoles or engulf cytosolic material. The membrane prevents enzymes from digesting cellular components and macromolecules. Lysosomal enzymes are activated at the acidic pH of the lysosome and inactivated at higher pH of the cytosol. This protects the cell in case the lysosomal enzyme are released in cytoplasm.

So, the correct option is 'A'.