M6P Receptor Protein Function
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Questions and Answers

What is the function of a vacuole in plant cells?

  • Synthesize proteins required for cell growth
  • Act as a storage organelle for nutrients and waste products (correct)
  • Regulate the cell's DNA replication process
  • Maintain constant turgor pressure by altering cell wall composition

    • How are vacuoles related to lysosomes in animal cells?

  • Both contain hydrolytic enzymes (correct)
  • Their primary function is to produce energy for the cell
  • Both regulate cell division in their respective cells
  • They share the same membrane composition

    • What is the role of vacuoles in maintaining homeostasis in plant cells?

  • Serving as the site for protein synthesis
  • Transporting genetic material within the cell
  • Regulating turgor pressure and pH levels (correct)
  • Facilitating cellular respiration

    • How do substances stored in plant vacuoles contribute to the plant's survival?

    <p>By providing a defense mechanism against predators</p> Signup and view all the answers

    What happens to proteins stored in vacuoles of seeds like peas and beans during germination?

    <p>They are hydrolyzed into amino acids for the developing embryo</p> Signup and view all the answers

    How does a vacuole enable plant cells to achieve a large increase in volume without increasing cytosol volume?

    <p>Through turgor-driven cell enlargement by water uptake into the vacuole</p> Signup and view all the answers

    At what pH does the M6P receptor release its specific oligosaccharide?

    <p>6.0</p> Signup and view all the answers

    What happens to the lysosomal hydrolases when the pH drops further during endosomal maturation?

    <p>They start digesting endocytosed material</p> Signup and view all the answers

    What is required for transport of the M6P receptor back to the Golgi apparatus?

    <p>Signal peptides in the cytoplasmic tail of the M6P receptor</p> Signup and view all the answers

    What happens to some of the hydrolase molecules tagged with M6P for delivery to lysosomes?

    <p>Transported 'by default' to the cell surface</p> Signup and view all the answers

    How are escaped lysosomal hydrolases that reach the cell surface brought back to lysosomes?

    <p>Via receptor-mediated endocytosis through early and late endosomes</p> Signup and view all the answers

    Why do lysosomal hydrolases do little harm in extracellular fluids?

    <p>They become inactive in neutral pH</p> Signup and view all the answers

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