This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
Which of the follow ing protein is synthesized in free ribosome - 
Select and explain. 
A. Cytosolic proteins, B. Secretery proteins, C. Membrane proteins, D. None
A: Cytosolic proteins
Answer: A: Cytosolic proteins 
Explanation: Ans. is 'a* i.e., Cytosolic proteinsRibosomeso 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.o Both tvpes can synthesize protein : -Proteins synthesized by polyribosomesCytosolic (free) PolyribosomesBound (rough ER) Polyribosomeso Cytosolic proteins, e.g.. Hemoglobino Cytoskeletal proteinso Mitochondrial proteinso Nuclear proteinso Peroxisomal proteinso Synthesize all membrane proteinsMitochondrial membraneER membraneGolgi apparatus membranePlasma membraneo Secretory proteinso Lysosomal enzymes