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Lipids of Physiologic Significance Lecture Summary

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Lipids of Physiologic Significance Lecture Summary

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Questions and Answers

What are waxes?

Esters of fatty acids with lower molecular weight monohydric alcohols

Substances found only in the skin of humans

Water repellents on the leaves of some plants, feathers, and the cuticles of certain insects (correct)

Completely water-soluble and generally liquid at biological temperatures

Where is wax production associated in humans?

Sebaceous glands of the skin (correct)

Salivary glands of the mouth

Sweat glands of the skin

Mucous glands of the skin

What do phospholipids contain?

Phosphoric acid residue and nitrogen-containing bases (correct)

Carbohydrates and fatty acids

Nitrogen-containing bases like adenine and guanine

Amino acids and phosphoric acid residue

What are neutral lipids?

Uncharged lipids like acylglycerols (glycerides) and cholesterol Signup and view all the answers

How do fatty acids occur in the body?

Primarily as unesterified form and esters (primarily TAG, cholesteryl esters, and phospholipids) Signup and view all the answers

Which property is shared by lipids such as fats, oils, steroids, and waxes?

Relatively insoluble in water Signup and view all the answers

What is the main storage form of lipids in adipose tissue?

Triacylglycerols Signup and view all the answers

What is the energy value comparison between 1 gram of carbohydrate, 1 gram of protein, and 1 gram of fat?

1 gram carbohydrate = 4 calories, 1 gram protein = 4 calories, 1 gram fat = 9 calories Signup and view all the answers

What is the structure of a typical Triacylglycerol (TAG)?

Three molecules of fatty acid esterified to a molecule of glycerol Signup and view all the answers

What do Triacylglycerols (TAGs) form within white adipocytes when stored as the major energy reserve of the body?

Large oily droplets that are nearly anhydrous Signup and view all the answers