Question

Lysosomes are the principal site of cellular digestion. They :

1) Normally maintain a pH of about 11 to 12.5.
2) Contain F-type ATPases that pump protons out of the organelles.
3) Contain heavily glycosylated membrane proteins.
4) Are homogeneous in size and shape.
5) All of the above.

Answer 1

Lysosomes are organelles where cellular digestion takes place. They contain hydrolytic enzymes that break down organic polymers of all types. Lysosomes have a low pH maintained by proton pumps in their membranes.

Step-by-step explanation:

Lysosomes are round organelles surrounded by a membrane where cellular digestion takes place. They contain hydrolytic enzymes that break down organic polymers of all types. Lysosomes continuously break down old proteins, foreign materials, and wastes. They also bring about phagocytosis, a process in which foreign materials are brought into the cell and 'chewed up'. Lysosomes have a low pH maintained by proton pumps in their membranes.