Q. Consider the following statements and choose the correct options I. The endomembrane system, include plasma membrane, ER Golgi complex, lysosomes and vacuoles. II. ER helps in the transport of substamces, synthesis of proteins, lipoproteins and glycogen. III. Ribosomes are involved in protein synthesis. IV. Mitochondria help in oxidative phosphorylation and generation of ATP.
A) II, III and IV correct
B) I is correct
C) II is correct
D) III is correct
Explanation
Rough endoplasmic reticulum (RER), the ER bearing ribosomes on their surface, is actively involved in protein synthesis, secretion and transport of substances. Smooth endoplasmic reticulum (SER), the ER devoid of ribosome, is the major site for synthesis of lipid. In animal cells lipid-like steroidal hormones are synthesized in SER. Ribosomes are the site of protein synthesis. Mitochondria are the site of aerobic respiration. They produce cellular energy in the form of ATP hence, they are called ‘power house’ of the cell. Oxidative phosphorylation occurs on the inner membrane of mitochondria.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.