Structure without any membrane is: (A) Mitochondria, (B) Nucleus, (C) Nucleolus, (D) Endoplasmic reticulum
Answer is C. Nucleolus is present in nucleus. Theirfunction is to produce ribosome. They are not enclosed by a membrane and contain proteins, DNA, RNA. (REF TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 11)