Question

With what starting material are all lipids are built? Describe the process that a long carbon chain is rearranged into a multi-cyclic molecule that is basis for steroids?

Please explain in detail

Answer 1

http://lipidlibrary.aocs.org/Lipids/tag2/index.htm

Answer 2

Biological lipids originate entirely or in part from two distinct types of biochemical subunits or "building-blocks": ketoacyl and isoprene groups

b. Biosyethesis: The building block from which all carbon atoms of steroids are derived is the two carbon acetyl group of acetyl-CoA.
Stage 1: synthesis of isopentenyl pyrophosphate from three molecules of acetyl-CoA.
Stage 2: synthesis of cholesterol.
Stage 3: conversion of cholesterol to other steroids.