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Chapter 1 Biochemistry: An Evolving Science Multiple-Choice Questions 1) DNA is made from the building blocks adenine, guanine, cytosine and _____. A) uridine B) thymine C) inosine D) ribose E) None of the answers is correct. Answer: B Section: 1.2 2) The DNA backbone is made from repeating _____. A) monosaccharide units B) amino acid units C) sugar-phosphate units D) fatty acid E) None of the answers is correct. Answer: C Section: 1.2 3) The number of hydrogen bonds formed between A and T is _____. A) 1 B) 2 C) 3 D) 4
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