Question : 21.How does the proportion of saturation and unsaturation in membrane : 1318487

21.How does the proportion of saturation and unsaturation in membrane lipids affect the fluidity of the cell membrane?

A) Membrane fluidity increases with an increase in the percentage of unsaturation.

B) Membrane fluidity decreases with an increase in the percentage of unsaturation.

C) Membrane fluidity increases with an increase in the percentage of saturation.

D) Membranes are most fluid when there is an equal proportion of saturation and unsaturation.

E) Membrane fluidity depends only on the size of the carbon chains, and not on the proportions of saturation and unsaturation.

22.A tube of lipstick lists capric triglyceride among its ingredients.  Capric triglyceride is a simple triglyceride containing capric acid, a 10-carbon saturated fatty acid.  What is the structure of capric triglyceride?

A)

B)

C)

D)

E)

23.Dietary fats and oils are structurally both triglycerides, but fats are solids and oils are liquids at room temperature.  Which of the following best describes the reason for their difference in physical state?

A) Fats contain 3 identical fatty acid R groups and oils contain different R groups.

B) Oils contain 3 identical fatty acid R groups and fats contain different R groups.

C) Oils contain longer fatty acid R groups than fats do.

D) Fats contain more hydroxyl groups in their fatty acid R groups than oils do.

E) Oils contain a higher percentage of unsaturation in their fatty acid R groups than fats do.

24.When three fatty acids react with glycerol, a lipid known as a triglyceride is formed.  How are the fatty acids bonded to glycerol?

A) by amide bonds

B) by ester bonds

C) by glycosidic linkages

D) by acetal bonds

E) by hydrogen bonding

25.When palmitic acid, a 16-carbon saturated fatty acid, reacts with a 30-carbon unbranched alcohol, a wax is formed.  What is the structure of this wax?

A)

B)

C)

D)

E)

26.What two products are formed in the reaction between a fatty acid and an alcohol?

A)ester and hydrogenD)ether and hydrogen

B)ester and waterE)hydrogen and alkane

C)ether and water

27.What is the name of the product that results from the hydrogenation reaction below?

A)stearic acidD)linoleic acid

B)arachidic acidE)capric acid

C)palmitic acid

28.What two fatty acids are essential fatty acids?

A)palmitoleic acid and oleic acidD)linolenic acid and linoleic acid

B)linoleic acid and stearic acidE)stearic acid and oleic acid

C)arachidonic acid and eicosanoids

29.What products are formed from the complete hydrolysis of a triglyceride?

A)glycerol and 3 fatty acidsD)All of the choices are correct.

B)glycerol and 2 fatty acidsE)None of the choices are correct.

C)glycerol and 1 fatty acid

30.What is meant by the term “mixed” triglyceride?

A)It is a mixture of at least two different triglycerides.

B)It is the term used to describe the production of triglycerides.

C)It is a triglyceride containing different acyl groups.

D)It is the term for the digestion of triglycerides in the body.

E)It is a triglyceride in which all three acyl groups are identical.