In cells, proteins are synthesised in _______________.

Correct option is D

The correct answer is (d) Ribosome
 Ribosomes are the primary site of protein synthesis in cells.
 These are present attached to the surface of the rough endoplasmic reticulum and also in the free state in the cytoplasm.
 They are complex structures composed of RNA and protein, responsible for translating the genetic code (mRNA) into the amino acid sequence of a protein.
 Mitochondria: Generate energy molecules like ATP, important for various cellular processes including protein synthesis.
 Golgi apparatus: Modifies, packages, and sorts proteins for further transport within the cell or secretion.
 Nucleus: Houses the DNA, which provides the genetic code for protein synthesis.