Smooth endoplasmic reticulum is mainly the site of
Alipid and steroid synthesis
Bprotein synthesis
CDNA replication
Dcarbohydrate breakdown
Answer & Solution
Correct answer: A. lipid and steroid synthesis
Smooth ER lacks ribosomes and specialises in lipid synthesis — including the steroid hormones in animal cells. Rough ER (with ribosomes) is where protein synthesis happens, especially for secretory proteins.
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