Question

select the part whose main job is to send instructions to different parts of the cell. nucleus centrosome lysosome ribosome

Explanation:

The nucleus contains the cell's genetic material (DNA). DNA has the instructions for making proteins and regulating cell activities. It sends these instructions (in the form of mRNA) to different parts of the cell. The centrosome is involved in cell division (organizing microtubules). Lysosomes are for digestion (breaking down waste). Ribosomes are for protein synthesis (but they follow instructions from the nucleus).

Answer:

nucleus