Which of the following enzymes is responsible for the breakdown of proteins into smaller peptides and amino acids in the lysosome?

A Cathepsin ✓
B Pepsin
C Trypsin
D Carboxypeptidase

Explanation

Cathepsin is a lysosomal protease that breaks down proteins into smaller peptides and amino acids, playing a crucial role in protein degradation and turnover.

Mnemonic

CATHEPSIN = Cellular Acidic Transport Helping Eliminate Proteins Safely Inside Nucleus

Source

Alberts Molecular Biology of the Cell
Protein Metabolism Cell Biology Lysosomal Protein Degradation Medium MEDICAL Confidence: high