Question

Which of the following organelle is surrounded by two membranes?
A. Ribosomes
B. Peroxisomes
C. Vacuoles
D. Mitochondria

Answer 1

Hint: There are more than 8.7 million species on the earth. Every single species, including single-celled and multicellular organisms, is made up of cells. To keep the entire system alive, the cells give shape, structure, and perform a variety of functions. Organelles are a collection of functional structures found in the cell that are engaged in a variety of cellular functions.

Complete answer:
Mitochondria are considered as the cell's powerhouse. It contains two membranes that maximise its surface area, allowing it to be as productive as possible. The outer membrane surrounds all of the organelles, while the inner membrane is folded several times to form cristae, a layered structure.
As a result, the right response is (D) 'Mitochondria'.

Aside from the nucleus, two other organelles in eukaryotic cells are very important: the mitochondrion and the chloroplast. Double membranes enclose these specialised structures, which are thought to have evolved when all living things on Earth were single-celled organisms.

Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body, and Nucleus are double membrane bound organelles.

Almost all cells have a nucleolus, which is the largest and most visible compartment without a membrane. This globular shape, first described approximately 200 years ago, is now understood to perform key functions in ribosome synthesis.

Note:-
A nuclear membrane is a double membrane that surrounds and protects the nucleus of a cell. Its purpose is to keep the chromosomes apart from the remainder of the cell. The nuclear membrane has a series of microscopic holes or pores that allow certain items to move between the nucleus and the cytoplasm, such as nucleic acids and proteins.