10 Questions
What are waxes?
Water repellents on the leaves of some plants, feathers, and the cuticles of certain insects
Where is wax production associated in humans?
Sebaceous glands of the skin
What do phospholipids contain?
Phosphoric acid residue and nitrogen-containing bases
What are neutral lipids?
Uncharged lipids like acylglycerols (glycerides) and cholesterol
How do fatty acids occur in the body?
Primarily as unesterified form and esters (primarily TAG, cholesteryl esters, and phospholipids)
Which property is shared by lipids such as fats, oils, steroids, and waxes?
Relatively insoluble in water
What is the main storage form of lipids in adipose tissue?
Triacylglycerols
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
What is the structure of a typical Triacylglycerol (TAG)?
Three molecules of fatty acid esterified to a molecule of glycerol
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
This quiz provides a summary of the lecture on lipids of physiologic significance by Prof. Ian Albert S. Sangeles, MD. It covers the properties of lipids, their transport in the blood, and the types of lipids including simple, complex, and derived lipids.
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