Multiple choice

Which of the following DNA-modifying enzymes is regarded as a type of molecular motor?

  1. Nucleases

  2. Polymerases

  3. Helicases

  4. Topoisomerases

  5. DNA ligases
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C Correct answer
Explanation

Helicases are proteins that are a type of a molecular motor. They use the chemical energy in nucleoside triphosphates, predominantly ATP, to break hydrogen bonds between bases and unwind the DNA double helix into single strands. These enzymes are essential for most processes where enzymes need to access the DNA bases.

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