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Chapter 4: Problem 26

Which of the following molecules are typically found in the extracellular matrix? a. nucleic acids such as DNA b. peptidoglycans c. cellulose d. proteoglycans

Short Answer

Expert verified
d. proteoglycans

Step by step solution

01

- Understanding the Extracellular Matrix

The extracellular matrix (ECM) is a network of non-living tissue that provides support to cells. It is mainly composed of water, proteins, and polysaccharides.
02

- Analyzing Each Option

Evaluate each option to determine if it is typically found in the extracellular matrix. Look for substances known to be common components of the ECM.
03

- Option A: Nucleic Acids such as DNA

Nucleic acids such as DNA are found within the nucleus or mitochondria of cells, not the extracellular matrix. Therefore, this option is incorrect.
04

- Option B: Peptidoglycans

Peptidoglycans are components of bacterial cell walls and are not typically found in the extracellular matrix of eukaryotic organisms. Therefore, this option is incorrect.
05

- Option C: Cellulose

Cellulose is a major component of plant cell walls, not the extracellular matrix in animals. Therefore, this option is incorrect.
06

- Option D: Proteoglycans

Proteoglycans are a key component of the extracellular matrix, contributing to its structure and function. Therefore, this option is correct.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

proteoglycans
Proteoglycans are essential components of the extracellular matrix (ECM). They are complex molecules composed of a core protein and one or more glycosaminoglycan (GAG) chains. These GAG chains are long, linear carbohydrate molecules that are highly charged and attract water, which gives the ECM its gel-like consistency.

Proteoglycans serve several important functions in the ECM:
  • Providing hydration and swelling pressure to the tissue, which helps it resist compressive forces
  • Facilitating cell signaling by binding to growth factors and other signaling molecules
  • Organizing the ECM structure by interacting with other matrix components like collagen and elastin
Understanding the role of proteoglycans in the ECM will help you appreciate how cells are supported and maintained within their specific environments.
ECM structure
The extracellular matrix (ECM) is the non-cellular component present within all tissues and organs. It provides essential physical scaffolding for the cellular constituents and initiates crucial biochemical and biomechanical cues required for tissue morphogenesis, differentiation, and homeostasis.

The ECM is primarily composed of:
  • Proteins such as collagen, elastin, and fibronectin which provide tensile strength and elasticity
  • Proteoglycans and glycoproteins that fill the interstitial spaces, maintaining the ECM's hydrated state
  • Polysaccharides, especially glycosaminoglycans
The ECM is highly dynamic, being continuously remodeled and rebuilt in response to environmental changes. This restructuring is vital for processes such as wound healing and development.

By understanding the structure and function of the ECM, you can better grasp how it contributes to the overall functionality and adaptability of tissues.
cellular support
The extracellular matrix (ECM) provides critical support to cells, influencing their function, survival, and behavior. It acts as a scaffold that helps maintain tissue architecture and integrity.

Key roles of the ECM in cellular support include:
  • Anchoring cells: The ECM binds cells together to form tissues. This happens through cell-adhesion molecules like integrins which link the ECM to the cell cytoskeleton.
  • Regulating cell behavior: The ECM interacts with cell surface receptors to influence cellular activities such as migration, proliferation, and differentiation.
  • Providing biochemical signals: The ECM can sequester growth factors and cytokines, releasing them in a controlled manner to regulate cell function.
The dynamic interaction between the ECM and cells is essential for keeping tissues functional and responsive to their environment. By understanding how the ECM supports cells, you get insight into its role in maintaining overall tissue health.

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Most popular questions from this chapter

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