37 The schematic below shows how individual molecules of a soap surround and dis
ID: 636122 • Letter: 3
Question
37 The schematic below shows how individual molecules of a soap surround and dissol ve grease, so that it can be washed away using wat er The soap molecules actually form a three dimensional structure around the grease, called a: Micelle Lipid bilayer Microcell a. c. d. Detergent 38. Complimentary DNA strands are held together by which of the following? Covalent bonds between the phosphate groups. Hydrogen bonds between the phosphate groups c. Hydrogen bonds between complimentary bases. Covalent bonds between complimentary bases. a. d. 39. Triglycerides, such as animal fats, are most commonly used in nature for which of the following? Long-term energy storage The structure of cell membranes The structure of cell walls The structure of organelle me mbranes a. d. 2.-Deoxyguanosine-5'-phosphate (G) is found to account for 22% of the composition of a hypothetical fragment of double-stranded DNA. What is the percent composition of thymidine-5'-phosphate (T)? 28% 22% 39% 61% a. c. d. 41. Which of the following carbohydrates, upon reaction with sodium borohydride followed by a mild aqueous acid work-up, will produce an optically inactive molecule? a.Explanation / Answer
37. The correct answer is the formation of Micelle (a) which is an aggregate of molecules in a colloidal solution.
38. (c) Hydrogen bond between complimentary bases, i.e. between Adenine and Thymine and between Cytosine and Guanine
39. Triglycerides are the types of fats found in the blood, therefore the correct option for their use is (a) Long term energy storage
40. To find the percent composition of bases: 2x +2y = 100%, out of which 2x = x + x, i.e. composition of Cytosine and guanine (as they are equal), and 2y = y +y, i.e. composition of Adenine and thymine. Given is x = 22% (guanine), so 2y = 100 - 44 = 56%, therefore 2y = 56% or y = 28%. Therefore, correct option is (a) 28%.
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