Question

an important organelle is missing from this image of a eukaryotic cell undergoing protein synthesis. this organelle is not surrounded by a membrane but sits in the nucleus. it produces ribosomal subunits from proteins and ribosomal rna, which is exported into the cell proper. it is key to the process of protein synthesis taking place at ribosomes. what is this organelle? a centriole b centrosome c mitochondria d nucleolus

Explanation:

Centrioles are involved in cell - division, centrosomes organize microtubules, mitochondria are the power - houses of the cell. The nucleolus is a non - membrane bound organelle in the nucleus that produces ribosomal subunits from proteins and ribosomal RNA, which are key for protein synthesis at ribosomes.

Answer:

D. nucleolus