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Questions and Answers
Which cell wall component is most directly responsible for the structural strength and rigidity of the cell wall?
Which cell wall component is most directly responsible for the structural strength and rigidity of the cell wall?
- Pectin
- Cellulose (correct)
- Lignin
- Hemicellulose
What is the primary function of pectin in the cell wall?
What is the primary function of pectin in the cell wall?
- Acts as a glue to bind other components together (correct)
- Increases the flexibility of the wall
- Provides structural support
- Helps regulate water permeability
Which of the following statements accurately describes the role of lignin in the cell wall?
Which of the following statements accurately describes the role of lignin in the cell wall?
- It is the main structural component of the primary cell wall.
- It forms plasmodesmata, connecting adjacent cells.
- It is only found in the secondary cell wall and is the primary component of wood. (correct)
- It helps regulate water permeability.
Identify the incorrect statement about hemicellulose's role in the cell wall.
Identify the incorrect statement about hemicellulose's role in the cell wall.
Which of the following is NOT a way that the cell wall can participate in signaling between cells?
Which of the following is NOT a way that the cell wall can participate in signaling between cells?
Cell expansion is an unregulated process dictated by the amount of water in the cell
Cell expansion is an unregulated process dictated by the amount of water in the cell
Flashcards
Cellulose
Cellulose
The structural base component of the cell wall, acting like rebar.
Pectin
Pectin
A component that acts like glue to hold together cell wall components and adjacent cells.
Lignin
Lignin
A component found only in the secondary cell wall and is the basis of wood.
Hemicellulose
Hemicellulose
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Cell expansion
Cell expansion
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Study Notes
Cell Wall Components
- Cellulose forms the structural base of the cell wall, acting like rebar.
- Pectin acts as a glue, holding together components and adjacent cells.
- Lignin is found only in the secondary cell wall and is the basis of wood.
Hemicellulose and Cell Expansion
- Hemicellulose is branched, cross-linking cellulose fibers to strengthen the cell wall.
- Cellulose, not hemicellulose, is deposited as unbranched fibers, influencing cell expansion direction.
- Cell expansion is a regulated process; water, acidification, expansin activity, and cellulose fiber orientation all influence it.
Cell Wall Signaling
- Wall fragments can serve as defense or developmental cues.
- The porous nature of the cell wall allows molecules to pass through.
- Forming plasmodesmata increases cytoplasm connection.
- Expansins do not selectively block molecules from passing through the cell wall.
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