What is what type of biological molecule is dna helicase?

DNA helicase is an enzyme, a type of protein. More specifically, it's a motor protein. This means it uses energy (in the form of ATP hydrolysis) to perform mechanical work – in this case, unwinding the DNA double helix. Therefore, its classification within the broader categories of biological molecules is:

• Biological macromolecule: Protein
• Type of protein: Enzyme (specifically, a motor protein)

It's crucial to understand that while its function is related to DNA, it's not itself a nucleic acid (like DNA or RNA). It's a protein that acts upon DNA.