89. The side chain of isoleucine is a hydrocarbon. In a folded protein, where wo

Question

89. The side chain of isoleucine is a hydrocarbon. In a folded protein, where would you expect to find leucine? A. In the interior of a cytosolic enzyme B. On the exterior of the transmembrane portion of protein embedded in a membrane C. On the interior of the transmembrane portion of a protein embedded in a membrane D. Both A and B E. Both A and C 90. Mark Version B as you have version B of the exam. 91. Which of the following is typically not present in an animal cell? A. Plasma-membra ane C. Nucleoid D. Central Vacuole E. Both C and D 92. Which molecular interactions contribute to protein tertiary structures? A ionic interactions B, hydrophobic interactions C. covalent linkages D. hydrogen bonds E. All of the above 93. Aldehydes and ketones are very similar in that they both contain A phosphorus atoms B. a carbonyl group C. two "R" groups D. nitrogen atoms E. sulfur atoms 94. Which of the following does not represent a correct rlpolymer pairing? monome A. DeoxyribonucleottidelRNA B. Amino acidWprotein C. fatty acid/ lipid D. Monosaccharide/polysaccharide E. Monosaccharidelcellulose 95. oxygen forms covalent bond(s), carbon forms and nitrogen forms A, one, four, one B, four, four C, two, four, three D, two; four, one E. two; two; two 96. Which of the following protein structures is destroyed by denaturation? A. Primary B. Secondary C. Tertiary D. All of the above E. Only B and C What answer did you put for question 90? Please check question 90. Page 13 of 22

Explanation / Answer

89. Since isoleucine has a hydrocarbon side chain, this region is hydrophobic in nature. So, this amino acid is expected to find in the interior of a cytoplasmic enzyme or on the interior of the transmembrane portion of a protein embedded in a membrane.

Hence, the correct option is (D) Both A and B.

91. The correct option is (C) nucleoid

92. E. all of the above

93. B. a carbonyl group

94. A. deoxyribonucleic acid/RNA

95. C. Two; four; three

96. E. only B and C.

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