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Questions and Answers
What are the components of the primary cell wall in young plant cells and how does it change as the cell ages?
What are the components of the primary cell wall in young plant cells and how does it change as the cell ages?
The primary cell wall in young plant cells is made of cellulose. As the cell ages, it thickens with lignin.
Describe the structure of the plasma membrane and its function in cellular transport.
Describe the structure of the plasma membrane and its function in cellular transport.
The plasma membrane is composed of a phospholipid bilayer with hydrophilic heads on the outside and hydrophobic tails on the inside. It is selectively permeable, allowing some molecules to pass while blocking others.
What is the composition of the cytoplasm, and what does it contain?
What is the composition of the cytoplasm, and what does it contain?
The cytoplasm is composed of 80% water, 15% proteins, and 5% fats, sugars, and salts. It contains organelles and non-living components.
Explain the difference between the smooth and rough endoplasmic reticulum in terms of structure and function.
Explain the difference between the smooth and rough endoplasmic reticulum in terms of structure and function.
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How is the plasma membrane visualized, and what does this reveal about its structure?
How is the plasma membrane visualized, and what does this reveal about its structure?
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Describe the role and attachment points of the endoplasmic reticulum within the cell.
Describe the role and attachment points of the endoplasmic reticulum within the cell.
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Study Notes
Cell Wall
- Plant cells have a three-layered cell wall consisting of the middle lamella, primary wall, and secondary wall.
- The primary cell wall is composed of cellulose in young cells, which thickens with lignin as the cell ages.
Plasma Membrane
- The plasma membrane is a selectively permeable membrane that allows certain molecules to pass through while blocking others.
- It is composed of a phospholipid bilayer with hydrophilic heads on the outside and hydrophobic tails on the inside.
- The plasma membrane enables the transport of materials across the cell.
- It can be visualized using an electron microscope.
Cytoplasm
- Cytoplasm is the material that lies between the plasma membrane and the nucleus.
- It is composed of 80% water, 15% proteins, and 5% fats, sugars, and salts.
- Cytoplasm contains organelles and non-living components.
Endoplasmic Reticulum
- The endoplasmic reticulum is an interconnected system of tubules and vesicles.
- It is attached to both the plasma membrane and the nuclear membrane.
- The endoplasmic reticulum is responsible for lipid, carbohydrate, and protein synthesis.
- There are two types of endoplasmic reticulum: smooth and rough.
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Description
Learn about the composition and function of the cell wall and plasma membrane in plant cells, including the layers of the cell wall and the selective permeability of the plasma membrane.
