Question

CH401 Biochemistry I Homework Assignment #6, Carbohydrates 1. Indicate whether each of the following pairs of sugars consists of anomers, epimers, enantiomers, or none of these relationships. a. D-glyceraldehyde and dihydroxyacetone. annos b. D-glucose and D-mannose - epimers c. D-erythrose and L-erythrose er m ers d. a-D-glucose and B-D-glucose - enoshowers e. D-ribose and D-arabinose - f. D-galactose and D-glucose - 2. What does the enzyme mutarotase catalyze? Show by an equation using the glucose isomers. 3. Draw the Haworth structures of the following monosaccharides: D-glucopyranose, L- glucopyranose, D-glucofuranose, D-mannopyranose, D-galactopyranose, D-deoxy- ribofuranose, D-fructofuranose, D-Fructopyranose. For the purposes of this problem, ignore the distinction between a and B. 4. Draw the B-furanose and pyranose forms of D-ribose. 5. Give the systematic name (long and short form) for the following disaccharide: CH,OH CH OH H 87s

Answer 1

Sol:

To indicate the given following sugars belong to anomer, epimers, enantiomers or none of these, we need to know the definition of all these.

• Anomers: These are cyclic monosaccharide that are epimers.
• Epimers: Two isomers having opposite configuration at one carbon.
• Enantiomer: Compound which are mirror image to each other but non-super imposable.

D-glyceraldehyde and Dihydroxyketone posses none of the given relationship as they are Aldo-ketose.

Sol: 1 @.0. gleyceroefde hople and dihydroxey've tone Aldo ge to se К-сон 4-он ең -он Ceo ен,-он Ⓡ. O. Guicase and o- mamose (0 сно нон коен M on POM cң-он с-он → Epimers

Sol: toCA Анон ©. 0- erythrose and l- erythnose OH OH чон кон Тонко+н қон қон Enantiomers @.d-D-Glucose and B-o-qucose om Ho- ЕНЕН ктор қоң Anomens кеті ск-он @ @ D-galactose and D-glucose O-ribose and D. Anabinose сно сно. нон тонн OH Он щ-он си-он Epimers к он -он К- ниот кои кон сно) → Epiners он он сқан →