Biochemistry Question Cross-Check Round II! I\'ve answered these but would like
ID: 180649 • Letter: B
Question
Biochemistry Question Cross-Check Round II! I've answered these but would like them to be cross-checked. This is an old exam that I already submitted and earned a grade for. I'm using it as studying material for my comprehensive final.
osine d desm ne derivative ne b Y am nobut acid none a covalent bon The disulfide bond d. all of the cysteine residues b above rmed by only a b and 2s. Properties of peptides include a. e polymers c, the d. all covalent bond is only covalent of the above the bond four F The only a backbone a of peptide an contains acarboxy) repeating sequence 29. T 30. Characteristics (a a. it is a planar of the peptide bond clude all of following character structure double bond b. has a partial c. the a-C s are in the cis configuration e. the O has a partial chat the N has a parti alt of the above are characteristics the peptide bood of 31. Main stabilizing forces of secondary structure a. H-bonds b nic bridges c hydrophobicinteractions d disulfide bonds e, all 32. The a-helix a. Is Periodic polypeptide structure. b. Most common helical structure c. Is a rod like structure. d. Main chain is the inner part. 33. In the B-pleaded sheets a. H-bonding occurs between neighboring polypeptides b. Interactions occur between 2 strands form sheets. c. The amino acids R altermate, first above and henb d. Each peptide bond is trans and planar. W plane. c. to find the of alpha helix Glu-Asp at an dall b. lys-Arg a. proline y a 35. Stabilizing force(s) in tertiary structure H-bonds interaction e bonds a. structures sufficietto oss of function is c. ion pairs f three-dimensi F A loss called denatura 36 nt of glycine c a high de F Due to gree of 3 37. ry struExplanation / Answer
26. Some peptide hormones are derived from amino acids. Mostly these hormones are derivatives of tyrosine and tryptophan. The hormones epinephrine, norepinephrine, thyroxine and melatonin are amino acid derivatives. Epinephrine is a tyrosine derivative. Option c is correct.
27. The disulfide bond or disulfide bridge (S-S) is a covalent bond. It is found in amino acid cysteine in which the thiol groups two cysteine residues exhibit the oxidative folding. Option d is correct.
28. The peptides are short chains of amino acid monomers bound with a covalent bond called peptide bond that links amino group of one amino acid with carboxylic group of another amino acid. All peptides are not linear but some are cyclic peptides. Option c is correct.
29. Peptide bond is a covalent bond that links amino group of one amino acid with carboxylic group of another amino acid. The amino and carboxylic groups are attached to a carbon atom called alpha carbon. The R- groups attached to alpha carbon along with sequence NCCNCCNCCNCC. Therefore, the given statement is false.
30. Peptide bond is a covalent bond that links amino group of one amino acid with carboxylic group of another amino acid. The lone pair electrons of nitrogen in amide group are delocalized to give partial double bond character and the resultant of planar structure. The alpha carbon of peptide exists in cis - configuration and in some amino acids, both cis and trans configurations are balanced. The 'O' is electronegative and contains (-) charge and N contains partial (+) charge. Therefore, option e is correct.
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