Question

Which cell organelle secretes zymogen granules?
A. Lysosomes
B. Golgi body
C. Smooth E.R
D. Sphaerosomes

Answer 1

Zymogen granules are secreted by acinar (exocrine) cells of pancreas. Zymogen remains inactive unless exposure to acid or any other means. As soon it becomes active, it leads to activation of other protein-digesting inactivated enzymes.

Complete answer: Zymogen is an inactive proenzyme secreted by the pancreas. Zymogen remains in the cell in an inactive form to prevent protein digestion, which is synthesized in the cell. Zymogen granules are secreted by the smooth endoplasmic reticulum. Membranal ribosomes are absent in the smooth endoplasmic reticulum. The function of SER is involved in the formation of lipids which are used in the formation of the new cellular membrane.
a) Lysosomes are also known as suicidal bags. They are spherical sacs and filled with hydrolytic enzymes. These lytic enzymes are fatal to the cell if released outside from lysosomes and in lysosomes they remain in an inactive state. When lysosomes get burst, lytic enzymes come out and break down the cell.
b) Sphaerosomes are cell organelles also known as oleosome and they are responsible for protein synthesis.
Hence, the correct option is C.

Note: The endoplasmic reticulum is a cell organelle present in the cytoplasm of a cell. It is a flattened sac-like structure that consists of two subunits: Rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER consists of ribosomes on its outer surface, which are responsible for protein synthesis while smooth endoplasmic reticulum is devoid of ribosomes on its surface.