Question

Two-membrane envelope is found in
A) Mitochondria, golgi apparatus and chloroplast
B) Mitochondria, nucleus and chloroplast
C) Nucleus, Golgi apparatus and endoplasmic reticulum
D) Nucleus, ribosome and chloroplast

Answer 1

Cell is the structural and functional unit of an organism. There are certain organisms which consist of only one cell throughout its life cycle that particular cell performs all the functions required for its survival from reproduction to defence. To have this particular function there must be certain tiny things which give cells this power, these types of components are called cell organelles, each cell organelle has a different function within a cell.

Complete answer:
A cell is protected by a lipid bilayer composed of phospholipids which protect the cell and also functions in a semipermeable membrane for transport of specific molecules. Mitochondria is known as the powerhouse of the cell which is a double layered membrane, it is known as the powerhouse of the cell as they have electron transport chains responsible for the synthesis of energy currency ATP.

Nucleus is also known as the control and coordination unit of the cell which is responsible for the synthesis of DNA and mRNA which have major functions for the cells activity, it is surrounded by two layers of membrane.

Chloroplast is similar to mitochondria with respect to the membrane composition as they have transport proteins which are similar to each other and also chloroplast is surrounded by two layers of membrane.

Hence the correct answer is option B.

Note: Golgi apparatus have major function in packaging of proteins within the cell but they are coated with single layer of membrane and so is ribosome which is also known as protein factors of cells responsible for the synthesis of proteins by utilising the code from mRNA but have single layered membrane.