Question

write short notes on endoplasmic reticulum​

Answer 1

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Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins . All eukaryotic cells contain an endoplasmic reticulum (ER). In animal cells, the ER usually constitutes more than half of the membranous content of the cell. Differences in certain physical and functional characteristics distinguish the two types of ER, known as rough ER and smooth ER.

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Answer 2

Answer:

Endoplasmic reticulum also known as ER, which is an extensive network of membrane enclosed spaces.

two types of ER

1. Smooth ER - Outer and inner surfaces are smooth. Provides structural base for synthesis of certain steroid types such as Cholesterol, Progesterone and Testosterone etc.
2. Rough ER - Outer surface have rough appearance, due to attachment of Ribosomes. Rough ER is composed of cisterns and is actively involved in protein synthesis ( Smooth ER not involved in protein synthesis)

ER is not found in RBCs, eggs or embryonic cell and prokaryotic cells

Explanation: