Question

Choose the correct order of the steps involved in protein synthesis and modification that takes place in several different locations throughout the cell.

I. Ribosome
II. Nucleus
III. Golgi apparatus
IV. Endoplasmic reticulum

• A. I, II, III and IV
• B. II, I, IV and III
• C. III, II, IV and I
• D. II, I, III and IV
• E. IV, III, II and I

Answer 1

The correct option is B II, I, IV and III

Transcription is DNA dependent RNA synthesis and occurs in nucleus and forms hnRNA. After post transcriptional modifications of hnRNA into mRNA, the mRNA is transported out of the nucleus to the cytoplasm where it serves as a template for proteins synthesis on ribosomes. Ribosomes are present on rough endoplasmic reticulum. Golgi apparatus serves to modify and pack the proteins synthesized on ER by ribosomes. Thus, the correct answer is option B.