Which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids, and steroids? Biology Which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids, and steroids? A) ribosome B) lysosome C) smooth endoplasmic reticulum D) mitochondrion E) contractile vacuole Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+