Q. Protein synthesis in an animal cell occurs :
A) only on the ribosomes present in cytosol
B) on ribosomes present in cytoplasm as well as in mitochondria
C) only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
D) on ribosomes present in the nucleolus as well as in cytoplasm
Explanation
[Solution from source] Animal cells translate proteins on cytoplasmic 80S ribosomes (both free and ER-bound) and also on the 70S ribosomes inside mitochondria, which have their own DNA. The nucleolus assembles ribosomal subunits but does not make proteins. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.