Question

Which of the following not represents the features of lysosomes?

• A. A lower pH than the cytoplasm
• B. Reduced hydrolase activity
• C. Double membrane envelope
• D. All of the above
  

Answer 1

The correct option is C Double membrane envelope

• The interior of lysosomes is acidic (about pH4.8 to 5) compared with the slightly basic (about pH 7.2) cytosol.
• Lysosomes are single membrane organelles.
• All of the lysosomal enzymes are acid hydrolases, which are active at the acidic ph (about 5) that is maintained within lysosomes.
• The requirement of these lysosomal hydrolases for acidic pH provides double protection against uncontrolled digestion of the contents of the cytosol.
• So, the correct answer is " Double membrane envelope ".