Cholesterol is synthesized by virtually all tissues in human, although liver, intestine, adrenal cortex, reproductive organs (testis and ovaries) and placenta make largest contributions to the bodyâs cholesterol pool. Cholesterol is a waxy substance. Previous question Next question Get more help from Chegg. Cholesterol is present in tissues and in plasma either as free cholesterol or combined with a long-chain fatty acid as cholesteryl ester, the storage form. Cholesterol is essential for all living organisms. Synthesizes Cholesterol And Fat - Find out how cholesterol is synthesized. The other 30% originates from dietary absorption. Your liver makes all the cholesterol you need. Where is cholesterol synthesized? Expert Answer . Cholesterol is a tetracyclic alcohol and a type of sterol.Added to the sterol frame with the alcohol group at position 3 are 2 methyl groups at carbon positions 10 and 13 and a 2-isooctyl group at position 17. The molecule. These are cholic acid (found in the largest amount) and chenodeoxycholic acid (Figure 26â7). The primary bile acids are synthesized in the liver from cholesterol. It is synthesized from simpler substances within the body. Cholesterol can both be synthesized endogenously and obtained from the diet. In vertebrates, hepatic cells typically produce the greatest amounts. A typical North American diet contains approximately 450mg of cholesterol per day (of which 55% is absorbed), while cholesterol synthesis on such a modest cholesterol diet is 11â13mg/kg/day. The remainder of the cholesterol in your body comes from foods from animals. Cholesterol levels in the body come from two sources, dietary intake and biosynthesis. Most of the cholesterol used by active adults is produced in the liver, which produces ~70% of daily cholesterol demand (~1 gram). Cholesterol levels in the body originate from its biosynthesis and diet. Cholesterol is synthesized from cytosolic acetyl-CoA by a sequence of reactions: Glucose is a major source of carbon for acetyl-CoA. The molecule is unsaturated at position 5,6 with an alkene group. The total number of stereocenters is 8. The majority of cholesterol utilized by healthy adults is synthesized in the liver, which produces ~70% of the total daily cholesterol requirement (~1 gram). Acetyl-CoA is produced from glucose by the same sequence of reactions used to produce cytosolic acetyl-CoA for fatty acid biosynthesis. Cholesterol can also be obtained from food. Itâs not inherently âbad.â Your body needs it to build cells and make vitamins and other hormones. Note that significant amounts of cholesterol only occur in meat, eggs, and milk products; plants and mushrooms contain other sterols but very little cholesterol. It is absent among prokaryotes (bacteria and archaea), although there are some exceptions, such as Mycoplasma, which require cholesterol for growth. 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