Cholesterol is a. not essential in the diet; the human body can synthesize it b. all of these choices are correct c. not found in foods of plant origin d. an important part of human cell membranes and is necessary to make some hormones

b. all of these choices are correct

Explanation:

Cholesterol is the steroid alcohol and type of lipid. Steroid alcohol or sterols are a type of steroid and steroids are type of lipids. It is essential for human life.

Animals including human can synthesize cholesterol mainly in liver and intestine. It take place in endoplasmic reticulum with the starting molecule Acetyl-CoA. Human body can synthesize all the required cholesterol. As animals can produce cholesterol, it can be found in food sources from animals such as egg yolk and meat. As plants cannot synthesize cholesterol, it is not present in food of plants origin.Cholesterol is present in all cells of body. It is found in plasma membrane of the cells and helps to maintain the membrane fluidity. It is also used for the synthesis of several hormones in the body such as steroid hormones (corticosteroid) and bile acid.

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