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# The proteins and lipids, essential for building the cell membrane, are manufactured by

,b>(a) rough endoplasmic reticulum

**(b)** Golgi apparatus

**(c)** plasma membrane

**(d)** mitochondria.

**Correct Answer:** None. The Correct Answer is an endoplasmic reticulum (not rough endoplasmic reticulum alone)

**Explanation**:

The endoplasmic reticulum is a network of membranous tubules found within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.

It is a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells. It serves multiple functions, such as protein and lipid synthesis, folding, modification, and transport of proteins.

The endoplasmic reticulum is a type of cell organelle made up of two subunits:

the rough endoplasmic reticulum, and smooth endoplasmic reticulum.

(i) The rough endoplasmic reticulum has ribosomes attached to it and is involved in protein synthesis.

(ii) The smooth endoplasmic reticulum plays a crucial role in detoxifying many poisons and drugs in a cell. It is also responsible for lipid synthesis.

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