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Chapter 20: Problem 98

List three structural uses of proteins in the body.

Short Answer

Expert verified
Three structural uses of proteins in the body include: 1) forming the cytoskeleton within cells, providing shape, support, and facilitating cellular functions, with proteins like actin, tubulin, and intermediate filaments as key components; 2) providing structural support in connective tissues, with collagen as an essential component in tendons, ligaments, and cartilage; and 3) contributing to the structure and functionality of cell membranes, with integral proteins enabling movement of ions and molecules across the membrane, and serving as receptors for signaling molecules.

Step by step solution

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1. Building the cytoskeleton for cellular structure

One of the primary structural roles of proteins in the body is the formation of the cytoskeleton within cells. The cytoskeleton gives cells their shape, provides mechanical support, and facilitates various cellular functions such as cell division and movement. Proteins like actin, tubulin, and intermediate filaments are key components of the cytoskeleton.
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2. Providing structural support in connective tissues

Proteins also help provide structural support in connective tissues throughout the body. This includes tendons, ligaments, and cartilage. Collagen, a protein, is an essential component of these structures. It offers tensile strength and stability, allowing the connective tissues to carry out their supportive functions effectively.
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3. Contributing to the structure and functionality of cell membranes

Proteins play a vital role in the structure and function of cell membranes. The proteins embedded in the lipid bilayer, known as integral proteins, provide channels for the movement of ions and molecules across the membrane. Proteins also contribute to the mechanical and chemical stability of the membrane. Some proteins serve as receptors for signaling molecules, enabling communication between cells.

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