28B. Name three organelles involved in biosynthesis of steroids?

The three organelles involved in the biosynthesis of steroids are:

1. Smooth Endoplasmic Reticulum (SER): The smooth ER is involved in the synthesis of lipids, including steroids. It contains the necessary enzymes for this process.

2. Mitochondria: The mitochondria is involved in the first step of steroid synthesis. It contains the enzyme that converts cholesterol into pregnenolone, which is the precursor to all steroid hormones.

3. Golgi Apparatus: The Golgi apparatus is involved in the modification and transport of proteins, including enzymes necessary for steroid synthesis. It helps in the packaging of these proteins into vesicles for transport to their destinations.