M6P Receptor Protein Function

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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?

By providing a defense mechanism against predators Signup and view all the answers

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

They are hydrolyzed into amino acids for the developing embryo Signup and view all the answers

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

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

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

6.0 Signup and view all the answers

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

They start digesting endocytosed material Signup and view all the answers

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

Signal peptides in the cytoplasmic tail of the M6P receptor Signup and view all the answers

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

Transported 'by default' to the cell surface Signup and view all the answers

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

Via receptor-mediated endocytosis through early and late endosomes Signup and view all the answers

Why do lysosomal hydrolases do little harm in extracellular fluids?

They become inactive in neutral pH Signup and view all the answers