34 Questions
What is the function of lysosomes?
Intracellular digestion and degradation of external materials
What type of enzymes do lysosomes contain?
Acid hydrolases
What is the shape of lysosomes?
Spherical
What is the lipid composition of lysosomal membranes?
Single lipid bilayer
What pH environment is required for the activity of lysosomal enzymes?
Low pH (about 5)
Where are lysosomal enzymes initially synthesized before being transported to the Golgi apparatus for modification?
Endoplasmic reticulum
What is the primary function of vesicles that bud from the Golgi apparatus containing lysosomal enzymes?
Formation of primary lysosomes
What is the role of the lysosomal membrane in transporting the final products of digestion to the cytosol?
It transports the final products to the cytosol
Besides H+-ATPase, what other type of proteins can be found in the lysosomal membrane?
Transport proteins
How does the high glycosylation of lysosomal membrane proteins contribute to their function?
It protects them against luminal proteases
What is the pH maintained within the lysosomes?
pH 5
Where are lysosomal enzymes initially synthesized before being transported to the Golgi apparatus for modification?
Endoplasmic reticulum
What is the primary function of vesicles that bud from the Golgi apparatus containing lysosomal enzymes?
Formation of primary lysosomes
What is the role of the lysosomal membrane in transporting the final products of digestion to the cytosol?
It transports the final products to the cytosol
Besides H+-ATPase, what other type of proteins can be found in the lysosomal membrane?
Transport proteins
How does the high glycosylation of lysosomal membrane proteins contribute to their function?
It protects them against luminal proteases
What is the primary function of lysosomes?
Digestion of cellular components
What structures are digested by lysosomes?
Autophagosomes
What happens to the tertiary lysosome after digestion is complete?
It releases digestion products into the cytosol
What is the pH environment required for the activity of lysosomal enzymes?
pH 5
What is the function of autophagosomes?
Digestion of cellular components
Which organelle fuses with the lysosome to form the secondary lysosome?
Endosome
What is the primary function of lysosomes?
Intracellular digestion
What is the shape of lysosomes?
Spherical
What type of enzymes do lysosomes contain?
Acid hydrolases
What is the lipid composition of lysosomal membranes?
Single lipid bilayer
What pH environment is required for the activity of lysosomal enzymes?
Low pH (about 5)
Besides H+-ATPase, what other type of proteins can be found in the lysosomal membrane?
Transport proteins
Where are lysosomal enzymes initially synthesized before being transported to the Golgi apparatus for modification?
Rough endoplasmic reticulum
What is the role of the lysosomal membrane in transporting the final products of digestion to the cytosol?
It contains specific transport proteins
How does the high glycosylation of lysosomal membrane proteins contribute to their function?
It enhances stability and protection from degradation
What is the function of vesicles that bud from the Golgi apparatus containing lysosomal enzymes?
Transporting lysosomal enzymes to the endocytic pathway and lysosomes
What is the function of lysosomes in the degradation of external materials?
By endocytosis
What are lysosomal enzymes called, and what pH are they active at?
Acid hydrolases, low pH (about 5)
Test your knowledge of lysosomes with this quiz! Learn about the structure, function, and role of these important cell organelles in biological processes.
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