Which of the following cell organelles is bounded by a single membrane and contains hydrolytic enzymes active in acidic pH?

💡 Solution & Explanation

Lysosomes are single-membrane-bound cytoplasmic organelles that contain a concentrated array of acid hydrolase enzymes operating optimally in acidic pH conditions. Other choices like mitochondria and chloroplasts are double-membrane structures responsible for energy metabolism, while ribosomes lack any surrounding membrane entirely. These organelles play a critical defensive and recycling role by breaking down cellular debris and foreign invaders.