which of the following groups correctly shows intrachain, mainchain hydrogen bon

Question

which of the following groups correctly shows intrachain, mainchain hydrogen bonding in an alpha helix from the i+4 residue back to the ith residue, where the *** represents the hydrogen bond? (first hydrogen bonding group is from the i+4 residue and the second is from the ith residue)
a. C=O *** H-O
b. C=O *** H-N
c. NH3 *** O=C
d. -N-H *** O=C

If all the histidines in the alpha beta/alpha beta protomer interlace were mutated to arginines. what is the most likely result? nothing would change since arginine is positively charged at physiological ranges of pH the mutant hemoglobin would favor the T state at physiological ranges of pH C. the mutant hemoglobin would favor the R state at physiological ranges of pH d the mutant hemoglobin could not undergo carbamation

Explanation / Answer

59) If all histidines in the alpha-beta/alpha-beta promoter interface were mutated to arginines, the mutant hemoglobin would favor R state at physiological favor. This is because the arginine is positively charged at physiological pH. This allosteric effector binds to a site on the tetramer that is only present on the Tense(T) form of hemoglobin. The site is in the form of a pocket which is bordered by beta subunits like positively charged groups such as His, Leu and Arg. Option c is correct.

60) This effect is called binding of oxygen to heme . Option d is correct.

61) Sickle cell anaemia causes changes in quatenary structure of protein. Option e is correct.

62) Option b is correct.

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