[Campbell Biology P.386] According to the passage, what is a key chemical difference between... | Practice Question

According to the passage, what is a key chemical difference between DNA and RNA?

  • A: DNA contains ribose sugar, while RNA contains deoxyribose sugar.
  • B: DNA has the nitrogenous base uracil, while RNA has thymine.
  • C: DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil.
  • D: DNA is typically single-stranded, while RNA is double-stranded.

Explanation

The passage states that 'RNA is chemically similar to DNA except that it contains ribose instead of deoxyribose as its sugar and has the nitrogenous base uracil rather than thymine.' It also mentions 'An RNA molecule usually consists of a single strand,' implying DNA is typically double-stranded. Therefore, option C accurately describes the chemical differences.