BIOC405 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE

BIOC405 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE [A]=[B] at T=273K [A][B] at T=330K [B][A] at [A]=[B]=1M, dH?0 dS?0 dG=dH-TdS dG0=-RTlnk at T=273k, k1, dG0 at T=330, k1, dG0 dG decreases as T increases dS is positive because -TdS has to be negative for dG to decrease dH has to be positive because dG is positive - 0 conclusion: dH0, dS0 ascorbic acid (H2C6H6O6) can be protonated twice with 2 different pKa's H2C6H6O6 = H+ + HC6H6O6- at pKa=4.1 HC6H6O6- = H+ + C6H6O62- at pKa=11.8 pH=pKa+log([B]/[A]) when pH is less than pKa, protonation is favored in a case where pH is less than pKa, the species with lower pKa will be more protonated at pH=3, H2C6H6O6 is more common which of the following tripeptides has both a net charge of -1 at pH=7 and 6 oxygen atoms RPA EDI SDA KDI EMI can't be SDA because Serine has a hydroxyl group N-term RPA C-term + +00 - N-term EDI C-term + --0 - N-term KDI C-term + +-0 - N-term EMI C-term + -00 - EMI has -1 charge which of the following heptad sequences corresponding to amino acid position a-g above is most likely to be found in a coiled coil KILHAVI PGGPGGG WIVFILV IRNVSQT EVIDFYL in a coiled coil, a and d amino acids are hydrophobic Histidine is positively charged Proline has NH, can hydrogen bond with water Tryptophan is non-polar, Phenylalanine is non-polar Isoleucine is non-polar, Valine is non-polar glutamic acid is negatively charged, Aspartic acid is negatively charged between WIVFILV and IRNVSQT, IRNVSQT is more preffered as an answer because Isoleucine and Valine are more likely to interact with each other while Trp and Phe have ring structures and pretty stable which one has 5 fold symmetry axis octahedral tetrahedral icosahedral D4 octahedral has 4 fold tetrahedral has 2 fold icosahedral has 5 fold D4 has 4 fold which of the following decreases the P50 of hemoglobin binding O2 reducing pH