Question

why do lipids and proteins constituting the cell​

Answer 1

Explanation:

Lipids present in the cell membrane are synthesized in the smooth endoplasmic reticulum which does not contain the ribosomes. However, the proteins are produced in the rough endoplasmic reticulum, which is called so because it has the ribosomes attached to the endoplasmic reticulum. Ribosomes help in protein synthesis.

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Answer 2

The lipids and proteins are synthesized in the endoplasmic reticulum.The proteins get synthesized in the rough endoplasmic reticulum. And the lipids get synthesized in the smooth endoplasmic reticulum.  hope it helps :))