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Ch. 11 - Cell-Cell Interactions
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoFreeman 8th EditionCh. 11 - Cell-Cell InteractionsProblema 1
Capitolo 11, Problema 1

What is a fiber composite? How do cellular fiber composites resemble reinforced concrete?

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Begin by understanding the term 'fiber composite'. In biology, a fiber composite is a structure composed of fibrous proteins embedded in a matrix. These composites provide strength and flexibility to cells and tissues.
Next, explore the components of cellular fiber composites. Typically, they consist of long, fibrous proteins like collagen or cellulose, which are embedded in a gel-like matrix made of polysaccharides or other molecules.
Consider the analogy to reinforced concrete. Reinforced concrete is made of steel bars (rebar) embedded in concrete. The steel provides tensile strength, while the concrete provides compressive strength. Similarly, in cellular fiber composites, the fibrous proteins provide tensile strength, and the matrix provides compressive strength.
Examine how this structure benefits cells. The combination of fibers and matrix allows cells to withstand mechanical stress, maintain shape, and facilitate movement, much like reinforced concrete supports buildings and structures.
Finally, reflect on the biological significance. Fiber composites are crucial for the structural integrity of tissues, enabling them to perform their functions effectively, such as in skin, cartilage, and plant cell walls.

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Fiber Composite

Fiber composites are materials made from two or more constituent substances that have different physical or chemical properties. In biology, cellular fiber composites consist of fibrous proteins embedded in a matrix, providing structural support and flexibility to cells and tissues, similar to how synthetic composites are used in engineering.
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Cellular Matrix

The cellular matrix is the non-cellular component present within tissues, providing structural and biochemical support to surrounding cells. It is composed of various proteins and polysaccharides, forming a scaffold that maintains tissue integrity and facilitates communication between cells, akin to the matrix in reinforced concrete.
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Reinforced Concrete

Reinforced concrete is a composite material where concrete's compressive strength is combined with the tensile strength of steel reinforcement. This analogy applies to cellular fiber composites, where fibrous proteins provide tensile strength, and the matrix offers compressive support, together enhancing the mechanical properties of biological tissues.
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Domanda del libro di testo

Which of the following actions correctly describe a role performed by at least one type of intercellular connection? Select True or False for each statement.

T/FAllows communication between adjacent cells.

T/FForms a watertight barrier between the cells.

T/FUses components of the extracellular matrix to indirectly connect adjacent cells.

T/FAssociates with cytoskeletal components to resist pulling forces.

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Domanda del libro di testo

Where are protein components of the extracellular matrix synthesized?

a. In the rough ER

b. In the Golgi apparatus

c. In the plasma membrane

d. In the extracellular layer itself

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Domanda del libro di testo

What does it mean to say that a signal is transduced?

a. The signaling molecule enters the cell directly and elicits a cellular response.

b. The signal is generated by the production of proteins.

c. The physical form of the signal changes between the outside of the cell and the inside.

d. The signal is amplified.

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