Which of the following amino acids is most unlikely to be present in a beta sheet? O Leucine O Valine O Lysine O Isoleucine
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- 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 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-fructofuranoseQuestion 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 proline
- Question 1 Amyloid Precursor Protein (APP) is actually thought to be a natural neuroprotective agent induced by neuronal stress or injury. O True O False Question 2 Which of the following is not a property of serine protease? A globular protein with high molecular weight ● It is initially synthesized as a zymogen It has uniquely activated tyrosine residue at the active site Cleaves polypeptide at a specific amino acid residue Question 3 RTK is activated by cyclic AMP. O True FalseQUESTION 4 What percent are the following two 20 amino acid peptides similar? MTEKRVQDKAKLIVDEQACT MTDVRIQERTKLKVFEQLCI O 25% O 25% O 75% 90%Question 1Predicting Secondary Structure Which of the following peptides is more likely to take up an -helical structure, and why? (a) LKAENDEAARAMSEA (b) CRAGGFPWDQPGTSN
- Question 11. // Hint: Isoelectric focusing separates proteins based on their pI values, and can separate proteins that only differ by a net charge of ±1.±1. Recall that an amino acid residue with a negatively charged R group has a relatively low isoelectric point (pI) where it has zero net charge. Likewise, an amino acid residue with a positively charged R group has a relatively high isoelectric point (pI) where it has zero net charge. Order from Low pH to High pHQUESTION 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 22: which of the following secondary structures would you expect to find on the surface of a globular protein? Alpha helix Beta sheet Loops between two alpha-helices None of the above because water would disrupt the hydrogen bonding that stabilizes these structures A,B and C as long as the polar and charged amino acid side chains face the surface of the protein.
- Question 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 NoncompetitivelyQuestion 4. If you were to synthesize a tetrapeptide consisting of all alanine residues, you would have how many bonds between carbon and nitrogen?Question 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-galactopyranose