Question

Which of these is not a function of Golgi apparatus?
a. Site of synthesis of glycoproteins and lipids
b. Secretion
c. Membrane transformation
d. Site of protein synthesis

Answer 1

Hint: Golgi apparatus or Golgi body is a membrane bound organelle found in eukaryotic cells. It consists of various sac-like structures called cisternae. Among all the cell organelles of the cell, Golgi apparatus is one of the main cell organelles which carry out many functions of the cell.

Complete answer:
A normal animal cell consists of many cell organelles such as nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus etc.

Golgi apparatus consists of 6-8 units which are long, flattened sac-like structures called cisternae which perform various functions that are necessary for cell working. Some of the main functions of the Golgi apparatus are:

Formation of glycoproteins and lipids take place in Golgi bodies as Golgi bodies attach various carbohydrate molecules to the respective proteins which help them to identify their destination. This occurs when various proteins from the endoplasmic reticulum enter the Golgi bodies for their modification according to their functions.

Golgi bodies are also observed in secretion of various enzymes (in some cases) and various vesicles. The Golgi bodies secrete various vesicles which pinch off from the cisternae and transport various molecules of proteins and lipids via pinocytosis.

The Golgi bodies are also involved in the synthesis of membranes such as semi permeable or impermeable membranes. It forms a membrane that is used by many membrane bound organelles within the cells.

Other than this, the site of protein synthesis is ribosomes. Ribosomes are present on the surface of the endoplasmic reticulum or can occur free in cytoplasm. Ribosomes read the mRNA and synthesize the protein chain. After the polypeptide chain is synthesized, the proteins enter the Golgi apparatus for their modification, packaging and transportation of protein to various sites.

Hence, The correct answer is option (D).

Note: The Golgi apparatus lies just near the endoplasmic reticulum so that it can catch the proteins synthesized by the ribosomes present on the surface of the endoplasmic reticulum. Apart from protein packaging, modification and transportation, Golgi is also responsible for formation of lysosomes which are also known as the suicidal bags.