Question

Which of the following statements is not true?
A. Lysosomes arises from Golgi apparatus
B. Lipid molecules in cell are synthesized by smooth endoplasmic reticulum
C. Rough endoplasmic reticulum contains ribosomes
D. Nucleolus is the site of enzyme synthesis.

Answer 1

Hint:- A cell is a fundamental structural and functional unit. A cell is the fundamental building block of life, according to the postulates of cell theory, which tends to make anything alive and is self-sufficient to perform all of an organism's fundamental functions. There are various functional structures in the cell that are collectively called Organelles, and they are associated with different cellular functions.

Complete Answer:-
Lysosomes originate by the process of budding off the trans-Golgi network membrane, a region of the Golgi complex concerned for sorting newly synthesized proteins that can be designated for use in lysosomes, endosomes, or plasma membranes. In several metabolic processes, the smooth endoplasmic reticulum (abbreviated as SER) has functions. It synthesizes lipids, steroids, and phospholipids. The smooth endoplasmic reticulum is abundant in cells that secrete these products, such as those in the ovaries, testes, and sebaceous glands.
The endoplasmic reticulum can be either rough or smooth, and its role is to begin producing proteins for the functioning of the rest of the cell in general. It has ribosomes in the rough endoplasmic reticulum, which are small, round organelles whose function is to make these proteins. The nucleolus in the nucleus of eukaryotic cells is the unique structure present. It primarily involves assembling the ribosomes, modifying RNA transfer, and detecting cellular stress.
Thus, the right option is D.

Note:- The nucleolus, covering almost 25 percent of the volume of the nucleus, is considered the brain of the nucleus. It is primarily involved in the manufacture of subunits that unite to form ribosomes. The nucleolus, therefore, plays an important role in protein synthesis and the production of ribosomes in eukaryotic cells.