<prompt> Membrane proteins are synthesized in ?Free ribosomeBound ribosomeNucleolusMitochondria  <response>: Ans. is b i.e., Bound ribosomeRibosomes Ribosomes are the actual sites of protein synthesisQ. The ribosomes are small granules of RNAs. Ribosomes are usually occur in clusters called polyribosomes attached to one mRNA molecule, an arrangement that increases the rate of polypeptide synthesis. There are two types of polyribosomes : -Free cytosolic : - Present free in cytosol.Bound polyribosome : - Present on rough ER.Both types can synthesize protein : ? Proteins synthesized by polyribosomes Cytosolic free PolyribosomesBound rough ER Polyribosomes Cytosolic proteins, e.g., HemoglobinSynthesize all membrane proteins Cytoskeletal proteins Mitochondria membrane Mitochondrial proteinsER membrane Nuclear proteinsGolgi apparatus membrane u Plasma membranePeroxisomal protein Secretory proteins Lysosomal enzym 