Question

Lysosomes are made up of
A) One membrane
B) Two membranes
C) Three membranes
D) None of the above

Answer 1

Hint:Firstly let us know what a lysosome is. A lysosome is a membrane-bound organelle present in many animal cells. These are spherical vesicles that carry hydrolytic enzymes that can break down many forms of biomolecules.

Complete answer:
A lysosome has a particular structure, both of its membrane proteins ,and it's lumenal proteins. The scale of lysosomes varies from 0.1 μm to 1.2 μm with ~4.5–5.0 pH value. Lysosomes are often termed as “suicidal bags of the cell” or “ Cleanup crew”.

Lysosomes are the smallest organelle-like vesicle, surrounded by a single membrane. They have a basic shape and are spheres made up of lipid bilayer that encloses fluid that includes a number of hydrolytic enzymes wherein these help in breaking down foreign particles, dead cellular material, etc. The lysosomal membrane allows digestive enzymes to function at lower pH levels. Several hundreds of lysosomes are present in a single animal cell.

Additional information: Lysosome has three primary functions :-
i) Breakdown of macromolecules such as carbohydrates, lipids, proteins and nucleic acid.
ii) Repairing the cell membrane.
iii) Fight against foreign substances such as bacteria, viruses and other antigens.

Note:Along with lysosomes, organelles which are surrounded by a single membrane are Vacuole, Golgi Apparatus, Endoplasmic Reticulum etc. These organelles are present in a eukaryotic cell.
Dual-membrane organelles include Mitochondria and Chloroplast and are present in a eukaryotic cell.Organelles without membrane like Ribosomes are present in prokaryotic as well as eukaryotic organisms.