question_answer 22)

  Which of these options are not a function of ribosomes? I. It helps in manufacture of protein molecules. II. It helps in manufacture of enzymes. III. In helps in manufacture of hormones. IV. In helps in manufacture of starch molecules. (a) I and II                            (b) II and III                         (c) III and IV                        (d) IV and I

Answer:

  (c) Ribosomes are dense, spherical and granular particles which remains freely in the matrix or remain attached to endoplasmic reticulum. They are not bound by membrane and are present in both prokaryotic and eukaryotic cells. They play important role in synthesis of proteins. All enzymes are proteins but all hormones are not proteins.