19. To what structural feature does the term \"quatenary structure\" refer? A) t

Question

19. To what structural feature does the term "quatenary structure" refer? A) the sequence of amino acids in proteins C) the aggregation of polypeptides B) the overall folding pattern ofproteins D) the conformation of local regions of polypeptides 20. What is the major organic product of the following reaction? CHO P A) 1 8) 2 C)3 D) 4 ????. ?? H-N 21. Which of the following is not a strategy for the synthesis of polypeptides? A) Protect the a-amino group of the amino acid aal to reduce its nucleophilicity so that the group does not participate in nucleophilic addition to the carboxyl group of either aal or aa2. B) Cleave the polypeptide at specific peptide bonds, determine the sequence of each fragment, and then match fragments to arrive at the sequence of the polypeptide. C) Activate the a-carboxyl group of the amino acid al so that the group is susceptible to niucleophilic attack by the a-amino group of aa2. D) Protect the a-carboxyl group of the amino acid aaž so that the amino acid is not susceptible to nucleophilic attack by the a-amino group of another molecule of aa2 How many different peptides could be produced using one each of the following amino acids? Ala, Gly, His, Cys A) 6 B) 16 C) 24 D) 64 23. Consider the following image. Which level of protein structure is shown here? A) Primary C) Tertiary B) Secondary D) Quatenmary 24. How many triglycerides (including sterooisomers) are there which contain two molecules of stearic acid, and one of myristic acid? B) 6 C) 9 D) 12 25. Which of the following is not true? A) sodium soaps are prepared by saponification of triglycerides B) a by-product of the saponification of triglycerides is glycerol C) soap molecules assemble into micelles D) grease molecules absorb on to the surface of micelles

Explanation / Answer

Ans 19 : c) the aggregation of polypeptides

When two or more subunits of protein or polypeptide chains aggregate together ans operate as a single functional unit of protein, it is referred to as quaternary structure .

This structure is stabilised form of protein which occurs due to presence of covalent interactions and disulfide bonds.

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