MCAT Content / Membrane Bound Organelles And Defining Characteristics Of Eukaryotic Cells / Lysosomes Membrane Bound Vesicles Containing Hydrolytic Enzymes

Lysosomes: membrane-bound vesicles containing hydrolytic enzymes

Topic: Membrane Bound Organelles And Defining Characteristics Of Eukaryotic Cells

lysosome is a membrane-bound cell organelle that contains digestive enzymes for breaking down parts of the cell.

Animal cells have a set of organelles not found in plant cells: lysosomes. Lysosomes are a cell’s “garbage disposal.” Hydrolytic enzymes within the lysosomes aid the breakdown of proteins, polysaccharides, lipids, nucleic acids, and worn-out organelles. These enzymes are active at a much lower pH than that of the cytoplasm. Therefore, the pH within lysosomes is more acidic than the pH of the cytoplasm.

 

Practice Questions

 

Khan Academy 

 

MCAT Official Prep (AAMC)

Sample Test B/B Section Passage 10 Question 52


Key Points

• Lysosomes, which are found in animal cells, are the cell’s “garbage disposal.”

• Hydrolytic enzymes within them aid in the breakdown of proteins, polysaccharides, lipids, nucleic acids, and worn-out organelles.


Key Terms

Lysosome: found in animal cells, is the “garbage disposal”, breakdowns molecules and old organelles

Hydrolytic enzyme: enzyme needing water to break chemical bonds of large molecules

Organelles: membrane-bound compartments with specialized functions

Polysaccharides: a carbohydrate whose molecules consist of several sugar molecules bonded together

Cytoplasm: a thick solution that fills each cell and is enclosed by the cell membrane



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