question_answer 16)

  Select one which is not true for ribosome (a) Made up of two sub-units                                     (b) Form polysome (c) May attach to mRNA                                                (d) Have no role in protein synthesis

Answer:

                  (d) Ribosome are truly called as protein factory and they play a vital role in proteinsynthesis. Thus, the statement that ribosomes have no role in protein synthesis is nottrue.                                             Other statements are true for ribosome Ribosomes are made up of two subunits, i.e., large and small. In prokaryotes it is 70S (50S and 80S). In eukaryotes it is 80S (60S and 40S). Polyribosomes Several ribosomes attach to a single mRNA and form a chain like structure. Polysomes They are formed by the attachment of ribosomes with mRNA.