Question

Which of the following function is not related to the organelles that are considered to be a part of endomembrane system?

A Detoxification of drugs B Providing precursors of enzyme for the formation of lysosomes C Formation of plasma membrane during cytokinesis D Synthesizing non-secretory proteins

Answer 1

The correct answer is option D.

Synthesizing non-secretory proteins is not related to the organelles that are considered to be a part of endomembrane system.

• The endomembrane system is composed of the Endoplasmic reticulum, the Golgi apparatus, lysosomes, vehicles, cell membrane as well as nuclear membrane.

• Non-secretary proteins are ones that follow the non-secretary pathway of protein sorting.

• Such proteins are synthesized by the free ribosomes and thereby have no association with the endomembrane system.

• These proteins are directly targetted to the final organelles such as nucleus, cytoplasm, mitochondria, etc.

Answer 2

D) Synthesizing non-secretory proteins

Explanation:

Functions like detoxification of drugs, providing precursors of enzyme for the formation of lysosomes, formation of plasma membrane during cytokinesis are related to the organelles that are considered to be a part of endomembrane system. The endoplasmic reticulum, Golgi complex and lysosomes are the organelles that help perform these functions.

But synthesizing non-secretory proteins is not related to the organelles that are considered to be a part of endomembrane system. These proteins are synthesized by the ribosomes and not the endomembrane system.

Option D is the answer.