1. Which of the following is a difference between DNA and RNA? a) DNA uses Uricil while RNA uses Thymine b) DNA is single stranded while RNA is double stranded c) DNA has one less oxygen than RNA d) Both A and C

c) DNA has one less oxygen than RNA<br /><br />**Explanation:**<br /><br />The primary differences between DNA and RNA involve the sugar, one of the bases, and the typical structure.<br /><br />* **Sugar:** DNA uses deoxyribose sugar, while RNA uses ribose sugar. Ribose has one more oxygen atom than deoxyribose.<br />* **Base:** DNA uses thymine (T) as one of its four bases, while RNA uses uracil (U) instead of thymine.<br />* **Structure:** DNA typically exists as a double-stranded helix, while RNA is typically single-stranded. Although RNA can sometimes fold into complex structures.<br /><br />Therefore, option (a) and (b) are incorrect, making (c) the only correct statement. Option (d) is incorrect because while (c) is true, (a) is false.<br />