20. Proinsulin is converted into insulin by: (A) proteolytic excision of a specific peptide, (B) allosteric binding of glucose, (C) phosphorylation to the active form, (D) removal of phosphate by converter enzymes, (E) none of the above.

20. Proinsulin is converted into insulin by:
(A) proteolytic excision of a specific peptide,
(B) allosteric binding of glucose,
(C) phosphorylation to the active form,
(D) removal of phosphate by converter enzymes,
(E) none of the above.

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Proinsulin is conver...

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8. All of the following statements about cyclic sugars are true EXCEPT: (A) The a-anomer has the -OH of the anomeric carbon positioned on the same side of the sugar ring from the -CH2OH, (B) The five and six membered rings are more frequently observed due to stability, (C) In a chair conformation, the predominant form has the bulkiest substituents occupying equatorial positions, (D) The carbonyl carbon becomes a chiral center, (E) They can be formed by the intramolecular reactions to hemiacetals or hemiketals.

20. Proinsulin is converted into insulin by:
(A) proteolytic excision of a specific peptide,
(B) allosteric binding of glucose,
(C) phosphorylation to the active form,
(D) removal of phosphate by converter enzymes,
(E) none of the above.

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