What is the name of the membranous sac containing hydrolytic enzymes that can digest macromolecules?

The membranous sac that contains hydrolytic enzymes capable of digesting macromolecules is called a lysosome. Lysosomes are specialized organelles found in animal cells that play a critical role in breaking down various biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. They maintain an acidic environment, which is optimal for the activity of their enzymes, facilitating the degradation of cellular components and the recycling of materials within the cell.

In contrast, peroxisomes are involved in lipid metabolism and the detoxification of hydrogen peroxide, but they do not primarily contain hydrolytic enzymes for macromolecule digestion. Vacuoles are storage organelles that can store substances like nutrients or waste products and may be involved in maintaining turgor pressure in plant cells, but they do not house the specific enzymes for macromolecule digestion. Ribosomes are the sites of protein synthesis in the cell and do not have a membrane or digestive capabilities. Thus, the function and characteristics of lysosomes clearly identify them as the correct answer in this context.