Question

Lysosomes are the reservoirs (store houses) of

• A. hydrolytic enzymes
• B. secretory glycoproteins
• C. RNA and protein
• D. fats (or sugars or ATP)

Answer 1

Answer: (A)

hydrolytic enzymes

Answer 2

Lysosomes were discovered by Christian de Duve $(1955)$ from rat liver. Matile $(1964)$ discovered lysosomes in plants. Generally lysosomes are $0.2 - 0.8 \,\mu$ in size, irregular membranous vesicles filled with hydrolytic enzymes. They are polymorphic. About $40$ enzymes (all hydrolytic) are present in lysosomes. These include proteases, nucleases, glycosidases, lipases, phospholipases, phosphatases and sulfatases.