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- Question 18 Match the following structural composition with the corresponding polysaccharide Linear homoglycan of glucose connected by a1-4 linkages a. agarose v Branched glycan formed by alternating units of D-galactose and L-galactose b. amylose v Linear sulfated chains of alternating B-D-galactopyranose and 3,6-anhydro- a-galactopyranosyl units c. amylopectin v Poly-B-Dmannopyranosyluronic acid and/or Poly-a-L-gulopyranosyluronic acid d. Alginate v Repeating Poly-D-galacturonic acid residues e. agaropectin deacetylated straight-chain amino-polysaccharide polymer linked in a B(1-4) type of linkage f. Pectin g. carrageenan h. chitosanQuestion 13 Classify the following polysaccharides Chitin A. Heteroploysaccharide Cellulose B. Homopolysaccharide Peptidoglycan v Glycogen GlycosaminoglycanQuestion 15 gal(a1-6)gal(a1-6)glc(a1-2B)fru. Which of the complete IUPAC of this tetrasaccharide? a-D-galactopyranosyl-(1–6)- a-D-galactopyranosyl-(1-6)- a-D-glucopyranosyl-(1-2)-B-fructofuranose a-D-galactopyranosyl-(1-6)- a-D-galactopyranosyl-(1-6)- a-D-glucopyranosyl-(1-2)-B-fructofuranoside O a-D-galactopyranosyl-(1-6)-B-D-galactopyranosyl-(1–6)- a-D-glucopyranosyl-(1-2)-8-fructofuranoside O a-D-galactopyranosyl-(1-6)-B-D-galactopyranosyl-(1–6)- a-D-glucopyranosyl-(1-2)-8-fructofuranose
- Question 25 Calculate the net charges of the following peptides at pH 7.4. Indicate which amino acids bear chuarged side chans a) NH2-Asp-Leu-Phe-Ala-Lys-Pro-Glu-Gly-COOH b) NH2-GIn-Glu-Lys-Tyr-Trp-Arg-Ala-Leu-COOH DELLQuestion 4. Imagine the main chain of a protein bends back on itself so that two amino acid residues R1 and R2 come close to each other. In the table below are four possibilities for what R1 and R2 might be. In each case, decide whether a specific interaction could form between the residues. If a specific interaction could form, give the name of the interaction. R₁ cysteine tyrosine threonine arginine R₂ cysteine phenylalanine glutamine aspartate specific interaction? OO yes O yes O no no OO O yes no yes no name of specific interaction 0 П 0 0Question 2. An enzyme was found to convert Acetyl-coA to an acetyl-cysteine intermediate of the enzyme. The structure of cOA is: H H НО СН; HS — СH2— СH2 — N—C—CH,— CH2—N- С—С—С—CH;—0—Р- 0–CH2 Adenine н CH H H H Phosphopantetheine group of coenzyme A 2-O3PO ОН Draw a plausible chemical mechanism. Where is the acetyl-group in acetyl-coA? What is the reactive group of the protein? The reaction is enhanced at higher pH. How is this consistent with your mechanism? Is covalent catalysis involved?
- Question 9 Choose the CORRECT statement. O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of glycine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of valine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of arginine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of prolineQUESTION 26 The best description of a glycoprotein is only amino acids polymerized in a chain amino acid chains with covalently bound heme groups O amino acid chains and bound carbohydrate O a protein with a covalently bound lipid Oa polysaccharide with a fatty acid modificationQuestion 6 of 19 Proteasomal proteases can be inhibited by compounds such as ixazomib (shown below). How does this compound inhibit protease activity? HO Ixazomib O Uncomptetitively O Competitively O Noncompetitively
- Question 10 Observe this structure, use the pK, table, and choose the CORRECT statement. H2N-CH-C-OH CH2 OH O Tyrosine's side chain is involved in hydrogen bonding typical of secondary structures O Tyrosine's alpha carboxyl group is the most acid of the three dissociable groups O Tyrosine's side chain is partially dissociated at physiological pH O All of these are correctQuestion 9 یا۔ OH но HO OH OH но но но. но но ÓH Which is the correct IUPAC name of the structure given? O a-D-glucopyranosyl-(1->4)- a-D-glucopyranosyl-(1->3)- a-D-glucopyranose a-D-glucopyranosyl-(1->4)- B-D-glucopyranosyl-(1->3)- a-D-glucopyranose a-D-glucopyranosyl-(1->4)- B-D-glucopyranosyl-(1->3)- a-D-galactopyranose O a-D-glucopyranosyl-(1->4)- a-D-glucopyranosyl-(1->3)- a-D-galactopyranosequestion 1 : draw an α,α(2, 2) linkage between the two monosaccharides(two fructose ). label the glycosidic linkage. Must be Haworth question 2 : Draw glycosidic linkage between D-glucose linked to D-altrose with a β(1, 3) glycosidic linkage. label clearly the glycosidic linkage. must be Haworth.