Question

multiple choice question

what term is used to describe enzymes which work outside the cell?

apoenzymes
endoenzymes
exoenzymes
protoenzymes

Explanation:

Analyze the prefixes of the options

• "Apo-" refers to the protein portion of an inactive enzyme that requires a cofactor.
• "Endo-" means inside or within, referring to enzymes that function intracellularly.
• "Exo-" means outside or external, referring to enzymes secreted outside the cell to perform their function.
• "Proto-" refers to precursor forms of enzymes (proenzymes or zymogens).

Identify the correct term

• The question asks for enzymes that work outside the cell.
• The prefix "exo-" directly corresponds to "outside." Therefore, exoenzymes are secreted by cells to break down large macromolecules externally.

Answer:

• Apoenzymes
• Endoenzymes
• Exoenzymes (Correct answer)
• Protoenzymes