1. Explain how membrane flow participates with membranes that are part of the en
ID: 146308 • Letter: 1
Question
1. Explain how membrane flow participates with membranes that are part of the endomembrane system, but also part of the plasma membrane.2. Contrast constitutive exocytosis with regulative exocytosis with attention to the number of signal sequences needed for each.
3. Explain the "inside-outside rule.”
4. Explain how evolution of the endomembrane system gave rise to a new type of protein synthesis in cells 1. Explain how membrane flow participates with membranes that are part of the endomembrane system, but also part of the plasma membrane.
2. Contrast constitutive exocytosis with regulative exocytosis with attention to the number of signal sequences needed for each.
3. Explain the "inside-outside rule.”
4. Explain how evolution of the endomembrane system gave rise to a new type of protein synthesis in cells 1. Explain how membrane flow participates with membranes that are part of the endomembrane system, but also part of the plasma membrane.
2. Contrast constitutive exocytosis with regulative exocytosis with attention to the number of signal sequences needed for each.
3. Explain the "inside-outside rule.”
4. Explain how evolution of the endomembrane system gave rise to a new type of protein synthesis in cells
Explanation / Answer
Ans 1.The endomembrane system is a set of different membranes that are suspended in the cytoplasm within a eukaryotic cell. These membranes divides the cell into different functional and structural compartments.
In eukaryotic cell, the endomembrane system includes, the nuclear membrane, the ER, golgi apparatus, lysosomes, endosomes and vesicles. The organelles of endomembrane system are directly linked or by the transfer of molecules in vesicles through membrane segments. The plasma membrane is included in the endomembrane system because it interacts with the other endomembraneous organelles.
The endomembrane system is a series of compartments that work together for the transport of molecules, proteins and lipids etc. The proteins destined for the cell exterior are transported by secretory pathway: rough ER-golgi-secretory vesicles-cell exterior. Proteins synthesised on free ribosomes either retained in the cytosol or are transported to the nucleus, mitochondria, chloroplasts or peroxisomes. However, proteins synthesised on membrane bound ribosomes are transported directly into the ER. Then they may either remain within the ER or transported to the golgi apparatus and from there to endosomes, the plasma membrane or the cell exterior.
The nucleus membrane is made up of lipid bilayer encompasses the contents of nucleus. ER is a synthesis and transport organelle that transports various molecules via secretory pathway. The golgi apparatus is a series of compartments where molecules are packaged for the delivery to other cell components. Vacuoles are used for the storing the waste products. Vesicles are a small membrane enclosed sacs that stores or tranport substances.
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