Chiral carbon atom not present in: * Erythrose Dihydroxyacetone
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- in which of the following alternatives is the greatest amount of energy released from the hydrogenation of:a) 1 mole propeneb) 1 mole of butadiene 1.3c) 1 mole pentyn-2d) 3 moles of etheneIsobutylene, CH2=C(CH3)2, is used to prepare cold-flow rubber. Draw a structure for the addition polymer formed from this alkene.Carvone exists as a pair of enantiomers. (R)-(-)-carvone smells like spearment, whereas (S)-(+)-carvone smells like caraway. Why do these enantiomers have different smells (i.e., different biological activity) ?
- In the monosaccharide derivatives known as sugar alcohols, the carbonyl oxygen is reduced to a hydroxyl group. For example, D-glyceraldehyde can be reduced to glycerol. However, this sugar alcohol is no longer designated D or L. Why?Glucose is a polyhydroxyaldehyde. Determine the structureof the product of the reaction of glycine with glucose.cis, cis-9,12-OCTAdecadiENoic acid Enumerate the number of carbons and unsaturations (double bonds) in this molecule
- Solid iron(II) fluoride (FeF2, Ksp= 2.36 x 10-6) is dissolved in water. If 8.1 x 10-3 mol L-1 of iron(II) ion is found to be in solution. Is the solution saturated, unsaturated, desaturated or supersaturated.True or False: a. D-enantiomer is a mirror image of L-enantiomer b. In a D-carbohydrate, the hydroxyl group on the chiral carbon farther from the carbonyl group points to the right. c. L-carbohydrates are preferred by the humans when processing them after ingestion. d. Sugars that have the cyclic hemiacetal; groups on the anomeric carbon atom are reducing sugars e. In the beta-D –galactose the hydroxyl group on the anomeric carbon atom points up or above the plane of the paper. f. Maltose is a non-reducing sugar and does not have a hemi acetal group. g. Sucrose contain a hemiacetal group and hence a reducing sugar. h. Linen is prepared from celluloseOxidation of a thiol produces a disulfide. True or False
- The free energy of hydrolysis for acetic anhydride is221.8 kJ/ mol. The conversion of ATP to ADP also involvesthe cleavage of an anhydride bond. Its free energy of hydrolysis is 230 kJ/ mol. Explain the difference in these values.In observing a Haworth or cyclohexane-chair representation of alpha-d-glucopyranose, the anomeric carbon can de best identified by: a) the carbon atom which is bonded to the most H atoms b) the carbon atom which is bonded to the least H atoms c) The carbon atom which has its OH group pointing down d) The carbon atom which is bonded to two oxygen atoms Cellulose differs from amylose in that: a) cellulose has 1-6 branches while amylose does not b) amylose has 1-6 branches while cellulose does not c) amylose has alpha glycosidic bonds while cellulose has beta glycosidic bonds d) cellulose contains sulfate while amylose does not. The glycosaminoglycan (mucopolysaccharide) which is not normally associated with joint tissue is: a) heparin b) keratan sulfate c) chondroitin sulfate d) hyaluronic acid In glycoproteins, which amino acid does not bond sugar molecules? a) Asn b) Ser c) Thr d) Gly Which feature do all lipid molecules share in common? a) fatty acid molecules…true or false; 1. aarachidnonic acid is the amjor starting material for eicosanoids 2.both gylycoholic and taurocholic acid contain a side chain amide linkage 3. both cholesterol and cholic acid contain methyl group attachement