The triacylglycerol shown below is: II SH-O-C-(CH,),,CH; CH-O-C-(CH,),CH=CH(CH,),CH, CH,-0-Ç(CH,),CH=CHCH,CH=CH(CH,),CH, . 1-stearoyl-2-oleyl-3-linoleyl glyceride . 1-palmitoyl-2-oleyl-3-linolenyl glyceride . 1-myristoyl-2-oleyl-3-arachidoyl glyceride ). 1-palmitoyl-2-oleyl-3-linoleyl glyceride . 1-palmitoleyl-2-oleyl-3-arachidonyl glyceride

Identify the structure of O-a-D-sorbopyranosyl-(24)-B-D-glucopyranose below. The following structures will help: НО Н ОН х Н H H D-sorbose Н OH CH₂OH Н Н Н OH HO Н H HO H н HO ОН Н н Н О ОН O H Н CH₂OH OH OH н 0 CH2OH Н OH Н H OH Н CH₂OH H ОН Н OH Н Н Н РО OH Н HO OH н н -O CH2O Н O H H OH н Н OH CH₂OH о CHOH H H Н Ко OH H OH Н Н OH Н OH Н OH Н CH₂OH -OCHOH H OH O CH OH Н OH Н Н CH₂OH ОН он OH OH H OH H O OH CH₂OH OH ОН Н O OH OH D-glucose Н ОН Н ОН ОН

In the following scheme: HH, H₂C-C-C-Coo II HO H • NH, 1 H₂C-C-C-C000 H 2-Amino-3-ketobutyrate ↓ O H,C-C-CH₂-NH₂ Aminoacetone 0 0 H₂C-C-C-H Methylglyoxal H H₂C-C-COO OH D-Lactate O H₂C-C-C000 Pyruvate What molecule is being metabolized? Identify the reaction at each step. If it is an oxidation-reduction prove this is correct by showing oxidation state changes on the atoms in the structure.

Lecithins are glycerophospolipids (phosphoglycerides) containing choline, (CH3)3N+CH2CH2OH.(CH3)3N+CH2CH2OH. Draw a lecithin with stearic acid, CH3(CH2)16COOH,CH3(CH2)16COOH, at carbon 1 and oleic acid, CH3(CH2)7CH=CH(CH2)7COOH,CH3(CH2)7CH=CH(CH2)7COOH, at carbon 2.

A reducing sugar will undergo the Fehling reaction, which requires a(potential) free aldehyde group. Which of the disaccharides shown inFigure are reducing and which are nonreducing?

An unknown trisaccharide was treated with dimethyl sulfate which adds a methyl group to every free OH group. It was then subjected to acid hydrolysis (to break glycoside bonds). The products were 23, 4, 6-tetra-O-methylgalactosc, 23,4-ui-O methyl glucose, and 2,3.6-tri-O methylglucose. Treatment of the intact trisaccharide with 0(1 6)-gaiactosidase yielded galactose and a saccharide. Treatment of this disaccharide with a(l 4)-glucosidase yielded D glucose. Draw the structure of this trisaccharide and give its systematic name.

The monosaccharide shown below is the CH₂OH OH OH beta- L- D- alpha- Он OH anomer.

Identify the structures shown as glycerophospholipids or sphingolipids.

Select the choice that best describes the stereochemistry of the following amino acid, and rank the priority of the four groups surrounding the alpha carbon (in DESCENDING order: 1-highest 4-lowest) NH₂ CO₂II CH₂SH Cysteine H D and S, (1-NH2, 2-CH2SH, 3-COOH, 4-H) Land R, (1-NH2, 2-COOH, 3-CH2SH, 4-H) OL and R, (1-NH2, 2-CH2SH, 3-COOH, 4-H) D and S, (1-CH2SH, 2-COQH, 3-NH2, 4-H) H

Classify the following lipid (choose all that apply). HO, O wax ester O cis alkene(s) O steroid fatty acid O omega-6 O saturated O monounsaturated O omega-3 O triglyceride O polyunsaturated O trans alkene(s) O O