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Home⇒ Medical Science⇒ Biochemistry⇒ Structure and properties of peptides
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce Val-Lys-Glu-Met-Ser-Trp + Arg-Ala. [other wrong options] [Discuss in forum] Val-Lys + Glu-Met-Ser + Trp-Arg-Ala. Val-Lys-Glu-Met-Ser + Trp-Arg-Ala. Val-Lys-Glu-Met + Ser-Trp-Arg-Ala. |
Q22 ⇒ Which of the following statement is incorrect? None of the above [other wrong options] [Discuss in forum] Hemoglobin and myoglobin are the two oxygen binding proteins Hemoglobin transports O2 in the blood Myoglobin stores O2 in muscles |
Q23 ⇒ The heme is held in place by a bond between the Fe2+ and histidine [other wrong options] [Discuss in forum] the Fe2+ and cysteine the Fe3+ and histidine the Fe3+ and cysteine |
Q24 ⇒ The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce: Val-Lys-Glu-Met + Ser-Trp-Arg-Ala [other wrong options] [Discuss in forum] Val-Lys + Glu-Met-Ser + Trp-Arg-Ala Val-Lys-Glu-Met-Ser-Trp + Arg-Ala Val-Lys-Glu + Met-Ser-Trp-Arg-Ala |
Q25 ⇒ The major element of secondary structure in myoglobin and hemoglobin is the a-helix [other wrong options] [Discuss in forum] the P-strand the reverse turn All of these |
Q26 ⇒ What is the effect of a decrease in pH on hemoglobin oxygen affinity? Decrease in oxygen affinity [other wrong options] [Discuss in forum] Increase in oxygen affinity No effect on oxygen affinity Increase affinity in muscle cell otherwise decrease |
Q27 ⇒ Peptides in the fully extended chain conformation have Y = F = 180° [other wrong options] [Discuss in forum] do not occur in nature also have a cis geometry in their peptide bonds are equivalent to the (3-sheet structure |
Q28 ⇒ In β-pleated sheet structures neighbouring neighboring chains are hydrogen bonded [other wrong options] [Discuss in forum] chains lie in a flat plane neighboring residues are hydrogen bonded neighboring chains are connected by a-helices |
Q29 ⇒ The nature of peptide bond can be best explained as partial double bond [other wrong options] [Discuss in forum] truly double bond Hydrogen bond Van der waals force |
Q30 ⇒ The different orders of protein structure are determined by all of the following bond types except phospho-diester bonds [other wrong options] [Discuss in forum] peptide bonds disulfide bridges hydrogen bonds |
Q31 ⇒ What was the first protein whose complete tertiary structure was determined? Myoglobin [other wrong options] [Discuss in forum] Lysozyme Pancreatic ribonuclease Pancreatic DNase |
Q32 ⇒ Which of the following statements is incorrect? Protein G contains only a-helix [other wrong options] [Discuss in forum] Protein G contains both a-helix and P-sheet Fatty acid binding protein contains largely P-sheet Hemoglobin contains four sub-units |
Q33 ⇒ Which of the three subunits of the G proteins binds GDP and GTP? Alpha [other wrong options] [Discuss in forum] Beta Gamma Delta |
Or |