The function of the is photosynthesis protein synthesis asse

The function of the is photosynthesis protein synthesis assembly of of transport of material into and out of assembly of m RNA Which of the following is not required for protein to be in ER? ER signal sequence Signal Ribosome Signal Particle The smooth ER Which of the following is not associated with microfilaments? small size actin tubulin rope-like structure Myosin

Solution

1. Nucleolus is an eukaryotic organelle that performs the main function of assembly of ribosomes. option C is correct.

2. Protein synthesis takes place on rough endoplasmic reticulum (ER) that is studded with ribosomes. The synthesis of protein in ER required a signal recognition particle, signal peptidase and ER signal sequence. Smooth ER membrane is not required for protein synthesis.

3. The microfilaments are thin intertwined helical chains made up of actin molecules. They are composed of myocin molecules and are present in muscle cells. Microfilaments play a vital role in cellular contractile system including the muscle contraction and amoeboid movement. They serve as mechanical stiffener for microvilli of intestines. Therefore, the option C is correct.