Chapter 14 Study Questions
- List six functions of plant cell walls.
- Distinguish between the major components of plant cell walls: cellulose microfibrils, pectins, hemicelluloses, and proteins.
- Distinguish between primary and secondary cell walls. How do they differ in their chemical composition and mechanical properties?
- How is cellulose synthesized and where does synthesis occur? Discuss the nature of the enzyme involved, its subunit structure, and the basic reactions involved.
- The structural components of plant cell walls are interconnected and cross-linked by various types of bonds, including hydrogen bonds, ionic bonds, and covalent bonds. Give specific examples of each of these types of interactions found in plant cell walls.
- Following their synthesis and secretion, cell wall polymers assemble to form the cell wall. Does this process occur by self-assembly or by enzyme-mediated assembly? What is an example of the latter?
- Discuss the occurrence and function of cell expansion by tip growth versus diffuse growth in the typical plant life cycle.
- Discuss the meaning and significance of the term “stress relaxation” in relation to the process of plant cell expansion. Why is stress relaxation crucial for the process of plant growth?
- What is meant by “acid growth.” Which protein has been shown to mediate it? Describe the experiments that led to the discovery of this protein.
- What is lignin and how is it synthesized?
Textbook Reference: Overview of Plant Cell Wall Functions and Structures, p. 380
Textbook Reference: Overview of Plant Cell Wall Functions and Structures, pp. 382–392
Textbook Reference: Overview of Plant Cell Wall Functions and Structures, pp. 382–384
Textbook Reference: Overview of Plant Cell Wall Functions and Structures, pp. 384–387
Textbook Reference: Overview of Plant Cell Wall Functions and Structures, pp. 384–392
Textbook Reference: Primary Cell Wall Structure and Function, pp. 392–393
Textbook Reference: Mechanisms of Cell Expansion, pp. 393–396
Textbook Reference: The Extent and Rate of Cell Growth, pp. 397–400
Textbook Reference: The Extent and Rate of Cell Growth, pp. 397–400
Textbook Reference: Secondary Cell Wall Structure and Function, pp. 400–404