Which Would Be an Example of a Catalyst in Action

Question

Which would be an example of a catalyst in action?
A) a glycoprotein binding to a cell
B) a protein converting glucose and fructose into sucrose without being changed itself
C) glucose and galactose binding to form lactose
D) a phosphate group attached to a protein changing its shape

Accepted Answer

A catalyst is a substance that speeds up a chemical reaction without being consumed or changed itself. In option B, the protein acts as a catalyst by facilitating the conversion of glucose and fructose into sucrose without being changed itself. Options A, C, and D do not fit the definition of a catalyst as they involve binding, formation of a compound, or a chemical modification that changes the protein itself.