Question

Which of these is a single membrane organelle?
A. Lysosome
B. Mitochondria
C. Nucleus
D. ER

Answer 1

Hint: The cells are mostly bounded by a thin layer which is known as a membrane. It can be an outer covering as well as a layer around the internal compartment of a cell. The outer boundary is known as the plasma membrane and the sections enclosed by internal membranes are referred to as organelles.

Complete answer: Lysosomes are very tiny vesicles that contain a hydrolyzing enzyme. The lysosome is surrounded by a single membrane and its thickness is not more than 100mm. They are unique in the way that they are the only organelles to contain the right amount of protein in its lumen as well as in the plasma membrane. Both lumen and the plasma membrane have a symmetric structure. On the other hand, the nucleus and mitochondria are double membraned structures. The endoplasmic reticulum is made up of membrane-lined channels. It is found in every cell except for matured erythrocytes. The endoplasmic reticulum consists of 30-60% of the total cell membranes. The membrane system of the endoplasmic reticulum is double-membraned and is connected with the outer membrane of the nuclear envelope. Lysosomes work like the digestive system to break down, or digest, proteins, acids, carbohydrates, dead organelles, and other unwanted materials. It breaks larger molecules into smaller molecules. Those smaller molecules are used again as building blocks for other large molecules. It is present only in animal cells. In plant cells, vacuoles do similar functions.
Hence, the correct answer is Option A.

Note: Lysosomes work like the digestive system to break down, or digest, proteins, acids, carbohydrates, dead organelles, and other unwanted materials. It breaks larger molecules into smaller molecules. Those smaller molecules are used again as building blocks for other large molecules. It is present only in animal cells. In-plant cells, vacuoles do similar functions.