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Questions and Answers
What is the innermost portion of a mature plant cell wall composed of?
What is the innermost portion of a mature plant cell wall composed of?
- External protein
- Integral protein
- Secondary cell wall
- Primary cell wall (correct)
What are the main components of the hemicellulose in plant cell walls?
What are the main components of the hemicellulose in plant cell walls?
- Pectins and proteins (correct)
- Galactans and lipids
- Cellulose and galactans
- Hemicellulose and pectins
What is the function of plasmodesmata in plant cell walls?
What is the function of plasmodesmata in plant cell walls?
- To facilitate cell-to-cell communication (correct)
- To synthesize proteins
- To provide structural support
- To store nutrients
What is the characteristic of cell membranes according to the fluid mosaic model?
What is the characteristic of cell membranes according to the fluid mosaic model?
What is the relationship between the cell wall and middle lamella in plant cells?
What is the relationship between the cell wall and middle lamella in plant cells?
What is NOT a component of the endomembranous system in eukaryotic cells?
What is NOT a component of the endomembranous system in eukaryotic cells?
What is the main difference between the structural and functional aspects of the cell membrane?
What is the main difference between the structural and functional aspects of the cell membrane?
Which of the following cellular processes is NOT explained by the fluid nature of the cell membrane?
Which of the following cellular processes is NOT explained by the fluid nature of the cell membrane?
What is the main function of the Golgi apparatus in the cell?
What is the main function of the Golgi apparatus in the cell?
What is the primary function of the cell wall in plant cells?
What is the primary function of the cell wall in plant cells?
What does 'B' represent in the figure of the Golgi apparatus?
What does 'B' represent in the figure of the Golgi apparatus?
Which of the following components is NOT a part of the cell wall of plant cells?
Which of the following components is NOT a part of the cell wall of plant cells?
Which organelle is NOT involved in the synthesis, modification, and routing of proteins?
Which organelle is NOT involved in the synthesis, modification, and routing of proteins?
What is the main component of the cell wall of fungal cells?
What is the main component of the cell wall of fungal cells?
Which of the following is NOT a function of the cell wall of plant cells?
Which of the following is NOT a function of the cell wall of plant cells?
What is the primary function of the cell membrane in terms of permeation of substances?
What is the primary function of the cell membrane in terms of permeation of substances?
What is the component labelled as A in the diagram of the cell membrane?
What is the component labelled as A in the diagram of the cell membrane?
Which of the following cell wall components provides a barrier to undesirable macromolecules?
Which of the following cell wall components provides a barrier to undesirable macromolecules?
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Study Notes
Cell Wall Composition
- The innermost portion of a mature plant cell wall possesses hemicellulose.
- Cell walls of most fungi primarily consist of chitin.
Cell Membrane Structure
- The fluid mosaic model explains the structural and functional aspects of cell membranes.
- Cell membranes are not solid or solidified sheath, but quasifluid.
- Cell membranes provide stability, facilitate communication with other cells, and enable secretion.
Cell Wall Functions
- The cell wall of plant cells provides protection, helps in cell-to-cell interaction, and acts as a barrier to undesirable macromolecules.
Endomembranous System
- Endoplasmic reticulum, Golgi body, lysosome, and vacuoles are components of the endomembranous system because their structures are distinct, functions are distinct, and their functions are coordinated.
Intercellular Connections
- Plasmodesmata are tiny channels that traverse the cell wall and middle lamellae, allowing for direct communication between adjacent plant cells.
Protein Modification and Routing
- The endoplasmic reticulum is the main organelle involved in the modification and routing of newly synthesised proteins to their destination.
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