[Campbell Biology P.395] The discovery of ribozymes, RNA molecules that function as enzymes,... | Practice Question

The discovery of ribozymes, RNA molecules that function as enzymes, significantly impacted our understanding of biological catalysts. Which of the following is NOT a property of RNA that enables it to function as an enzyme, according to the text?

  • A: Its ability to base-pair with a complementary region within the same molecule, forming a specific three-dimensional structure.
  • B: The presence of functional groups in some RNA bases that can participate in catalysis.
  • C: Its ability to form a stable double helix structure that is more rigid than proteins.
  • D: Its ability to hydrogen-bond with other nucleic acid molecules, adding specificity to its catalytic activity.

Explanation

The text lists three properties: 1 RNA is single-stranded and can base-pair within itself to form a specific three-dimensional structure, essential for catalytic function. 2 Some RNA bases contain functional groups that participate in catalysis. 3 RNA can hydrogen-bond with other nucleic acids for specificity. The text does NOT mention RNA forming a 'stable double helix structure that is more rigid than proteins'; in fact, its single-stranded nature and flexibility in folding are key to its catalytic role, unlike the rigid double helix of DNA.