87. What is the electron configuration for the barium atom?
(A) 1s²2s²2p⁶3p⁶4s²
(B) 1s²2s²2p⁶3s²3p⁶4s¹
(C) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²
(D) [Xe] 6s²
(E) 1 s²2s²2p⁶3s²

83. Sort the following compounds in decreasing order by their pKa valuesCfrom highest to lowest). (A) I＞Ⅱ＞Ⅲ＞Ⅳ(B) IV＞Ⅲ＞Ⅱ＞I(C)IV＞Ⅱ＞Ⅲ＞I (D)Ⅲ＞I＞Ⅱ＞IV(E)I＞Ⅲ＞Ⅱ＞I

84. Which of the reactions below shows the correct usage of curly arrows? (A)(B)(C)(D)(E)

85. Which of the following radicals is the most stable? (A)(B)(C)(D)(E)

86. Disulfide linkages can form between________ . (A) two cysteine residues (B) two methionine residues (C) a cysteine residue and a methionine residue (D) two ttireonine residues (E) a methionine residue and a flireonine residue

88. Choose the correct statement. (A) A reaction that exhibits a negative value of △S cannot be spontaneous. (B) Exothermic reactions are always spontaneous. (C) Free energy is independent of temperature, (D) At constant pressure and temperature, a decrease in free energy ensures an increase in the entropy of the system. (E) None of the above.

89. Which of the following statements is true about the ionization energy ofMg+? (A) It will be equal to the negative value of the electron affinity ofMg. (B) It will be equal to the negative value of the electron aflfinity of Mg+・ (C) It will be equal to the ionization energy of Li. (D) It will be equal to the negative value of the electron affinity of Mg2+. (E) None of the above.

90. Please choose the correct description for confidence level. (A) Confidence level is the probability that the sample mean lies within a certain interval. (B) Confidence level is the probability that the true mean lies within a certain interval. (C) Confidence level is the range of values within which the population mean is expected to lie with a certain probability. (D) Confidence level is the range of values within which the true value is expected to lie with a certain probability, (E) None of the above.

1. Which of the following is NOT a cytoskeleton protein? (A) Actin, (B) Microtubule, (C) Intermediate filament, (D) Syntaxin, (E) Spectrin

2. Which of the following is a coding RNA? (A) snRNA, (B) rRNA, (C) mRNA, (D) tRNA, (E) snoRNA

3. Lamin is a skeleton protein and found in (A) Plasma membrane, (B) Nucleus, (C) Golgi apparatus, (D) Mitochondrion, (E) Lysosome