Which of the following triglycerides would you most expect to be a liquid at room temperature? saturated fat trans monounsaturated fat trans polyunsaturated fat cis monounsaturated fat ○ cis polyunsaturated fat

Which of the substance categories biological wax, mineral wax, bile acid, and sphingophospholipid has each of the following characteristics? More than one substance may have a given characteristic. a. Structure is based on a steroid nucleus b. A saponifiable lipid c. Contains at least one fatty acid building block d. Contains at least one amide linkage

21-70 How many different triglycerides can you create using three different fatty acids (A, B, and C)?

The following is a block diagram for a glycerophospholipid where the building blocks are labeled with letters and the linkages between building blocks are labeled with numbers. a. Which building blocks are fatty acid residues? b. Which building blocks are alcohol residues? c. Which linkages are ester linkages? d. Which linkages involve a phosphate residue?

Draw the general block diagram for a triacylglycerol.

21-87 Which statements are consistent with the fluid mosaic model of membranes? (a) All membrane proteins are bound to the interior of the membrane. (b) Both proteins and lipids undergo transverse (flip-flop) diffusion from the inside to the outside of the membrane. (c) Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane.

21-85 Which of the following statements is (are) consistent with what is known about membranes? (a) A membrane consists of a layer of proteins sandwiched between two layers of lipids. (b) The compositions of the inner and outer lipid layers are the same in any individual membrane. (c) Membranes contain glycolipids and glycoproteins. (d) Lipid bilayers are an important component of membranes. (e) Covalent bonding takes place between lipids and proteins in most membranes.

Which of the substance categories biological wax, mineral wax, bile acid, and sphingoglycolipid has each of the following characteristics? More than one substance may have a given characteristic. a. Contains at least one ester linkage b. Contains at least one alcohol building block c. Classified as a protective-coating lipid d. Classified as an emulsification lipid

21-7 For the diglycerides in Problem 21-6, predict which two will have the highest melting points and which two will have the lowest melting points.

Which of the terms triacylglycerol, glycerophospholipid, and sphingophospholipid applies to each of the following characterizations? More than one term may apply, or none of the terms may apply in a given situation. a. Must contain choline b. Lecithin c. Must contain an ester linkage d. Saponifiable