20. Which of the following is responsible for mechanical support, enzyme transport and protein synthesis

(a)  Dictyosomes                      (b)  Cell membrane

(c)   Mitochondria                    (d)  Endoplasmic reticulum

Ans. (d) Endoplasmic reticulum is scattered from plasma membrane to nuclear membrane, by which they provide mechanical support. Ribosomes found in surface of ER that is why, they participate in protein synthesis, they also transfer to many enzymes.