21. The structure of D-arabinose is shown below. How many stereoisomers arepossible for this molecule (including the one shown)?H.010HO-C-HH-C-OHH-C-OHPlease I need the solution in 10 minutesCH2OHD-ArabinoseA) EightB) FourC) SixD) One

In carbohydrates, the carbon that is attached to four different groups is called a chiral centre.…

Answered: 21. The structure of D-arabinose is…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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One sample of the globular protein peroxidase is hydrolyzed by heating with 6 M HC1. A second sample is denatured by treatment with acetone. a) How does the peroxidase structure change during hydrolysis? Will this change the biological activity of peroxidase? b) How does the peroxidase structure change during denatur-ation? Will this change the biological activity of perox-idase? c) Are either of these processes likely to be reversible?
The key reaction steps in the Edman degradation of polypeptides, which removes the N-terminal amino acid in the form of a "phenylthiohydantoin" (PTH-amino acid), are shown below. What is the expected outcome if the N-terminal amino acid is proline (Pro)? (The structure of proline is provided below for your reference.) NH-C00 NH CO0 phenyl isothiocyanate PITC NH CO0 NH CO0 peptide without the thiszolinone original Nterminal amino acid HE a PTH-amino acid Proline: HN HN. O Edman's reagent will not react with an N-terminal proline.
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…
An octapeptide was hydrolyzed and the amino acids separated. Its amino acid composition was determined: Gly (1); Ala (2); Val (1); Lys (2); Met (1); Asp (1). After incubation with FDNB and hydrolysis, 2,4-dinitrophenylalanine was detected. NO2 H H N C COOH ON- CH, Treatment with cyanogen bromide, which cleaves at M, resulted in two fragments: a pentapeptide containing two K residues and a tripeptide containing V, G, and A. The residues are not listed in any particular order. After treatment with trypsin, which cleaves at R and K, there were three fragments: two dipeptides and MGAV. What is the sequence of the octapeptide? Use the one-letter abbreviations for the amino acids, and do not use dashes.
Indicate the following for each disaccharide: I) type of glycosidic linkage i.e. a(1→4) II) configuration i.e. alpha or beta 1. ОН CH₂OH OH I) II) III) IV) 0 ОН 0 CH₂OH OH ОН OH 2. HO CH₂OH I) II) III) IV) ОН HOCH₂, OH ·0 НО 0 ОНА CH₂OH 3. HO I) II) III) IV) CH OH OH O ОН III) reducing or non-reducing sugar IV) name of each monosaccharide HO CH₂ ОН OH ОН 4. HO I) II) III) IV) CH₂OH 0 OH ОН CH₂OH OH О ОН ОН
Dehalogenase enzymes catalyze the clevage of C-X bonds. One such dehalogenase catalyzes the following reaction. An active site aspartate is thought to carry out the initial nucleophilic attack that expels the chloride. Select the most likely intermediate in the reaction. (Note the stereochemistry. Refer to P11.19 in the textbook if needed.) O O A C D OE -CH₂ H H₂C™ CO₂ H B CO₂ CI N H₂O Cr CO₂ H CO₂ нотум CH3 D CO₂ five N E CH₂
Give the systematic name for the disaccharide shown in the image by selecting the appropriate terms. H НО HO НО но H H The systematic name is The common name is ОН I maltose → нно HO a-D-glucopyranosyl H I -(1 →→ но OH 4- )- ОН I a-D-glucopyranose
Draw the structure of: The polysaccharide in (b) is dextran, a component of dental plaque. Here b: (b) a polysaccharide formed by joining D-glucose units in 1→6-α-glycosidic linkages
Select the term in column B which best matches the description in column A. There are more terms then needed. Column A Column B 1. The pentose sugar found in DNA. a) Cis fatty acid b) Trans fatty acid c) Coenzyme d) Cofacipr 2. Commonly referred to as "insoluble fiber". 3. Considered to be an amphipathic molecule. 4. A molecule with the formula C18H3602 is probably a e) Phospholipid 5. Bond created during the formation of the primary structure of a protein. ) Glycogen 6. A non-protein organic molecule needed for proper enzyme functioning. g) Cellulose 7. Pyrimidine base found only in RNA. h) Galactose i) Fructose 8. Increasing the number of these molecules in the cell membrane would increase the permeability of the cell membrane. i) Thymine k) Uracil 9. Bond which connects nucleotide monomers together. 1) Fatty acid m) Disaccharide n) Peptide bond o) A-Helix p) B-Pleated Sheet q) Ribose r) Deoxyribose 10.
Indicate the following for each disaccharide: I) type of glycosidic linkage i.e. a(1→4) II) configuration i.e. alpha or beta 1. OH CH₂OH 0 OH I) II) III) IV) OH CH₂OH -0 OH ОН OH 2. HO CH₂OH 0 I) II) III) IV) ОН HOCH2 ОН HO ОН CH₂OH 3. CH, OH CH2 О CG OH ОН HO ОН HỎ I) II) III) III) reducing or non-reducing sugar IV) name of each monosaccharide IV) OH OH 4. HO I) II) III) IV) CH₂OH OH 0 ОН CH₂OH OH ОН OH
An oligopeptide has the following amino acid sequence: NH2-Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above peptide is passed through a cation exchange chromatographic column (that is, the matrix of the column has negative charges) stabilized at pH 8.0, would you expect it to be retained on the column? c) Indicates the number of fragments, and the sequence of each of them, that would be obtained when treating the peptide in question with: i) trypsin, ii) chymotrypsin.
Draw the following Lipids in: A) Condensed (detailed) Structure, B) its Block Diagram. C) Show/Indicate the type of linkages per structure (put an arrow). 5) Glycosphingolipid/Sphingoglycolipid (use sphingosine, stearic acid, and D-galactose);

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21. The structure of D-arabinose is shown below. How many stereoisomers are possible for this molecule (including the one shown)? H 010 HO-C-H I н-с-он H-C-OH I CH₂OH D-Arabinose A) Eight B) Four C) Six D) One