MCAT Organic Question — Triacylglycerides | Next Step Test Prep MCAT Organic Question — Triacylglycerides | Next Step Test Prep

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Triacylglycerides consist of

I. A ribose backbone

II. a glycerol backbone

III. three phosphodiester linkages

IV. three ester linkages

a) I and III

b) II only

c) II and III

d) II and IV

Explanation

Triacylglycerides consist of a glycerol backbone bonded to three fatty acids. The bond between  each acid and the glycerol is an ester group. Phosphodiester linkages are found in DNA.

I. A ribose backbone

II. a glycerol backbone

III. three phosphodiester linkages

IV. three ester linkages

a) I and III, incorrect, Glycerol, not ribose, forms the backbone of triacylglycerides.

b) II only, incorrect, There are three ester linkages in addition to the glycerol backbone.

c) II and III, incorrect, Phosphodiester linkages are found in DNA not triacylglycerides.

d) II and IV, correct.

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