What does the ending -ase stand for in biology? ?

ase. ... The suffix -ase is used in biochemistry to form names of enzymes. The most common way to name enzymes is to add this suffix onto the end of the substrate, e.g. an enzyme that breaks down peroxides may be called peroxidase; the enzyme that produces telomeres is called telomerase.

Explanation:

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To form names of enzymes to put it simply