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Chapter 4: Problem 57

With which cellular structure does the extracellular matrix interact? a. cytoskeleton b. nucleus c. smooth endoplasmic reticulum

Short Answer

Expert verified
a. cytoskeleton

Step by step solution

01

Understand the Extracellular Matrix

The extracellular matrix (ECM) is a network of proteins and polysaccharides outside the cell, providing structural and biochemical support to surrounding cells.
02

Identify the Cellular Structures

List the cellular structures provided in the problem: cytoskeleton, nucleus, and smooth endoplasmic reticulum.
03

Determine the Correct Interaction

The ECM primarily interacts with the cytoskeleton. This interaction is facilitated through transmembrane proteins known as integrins that connect the ECM to the cytoskeleton inside the cell. The nucleus and smooth endoplasmic reticulum do not directly interface with the ECM in this manner.
04

Confirm the Answer

Based on the interaction between the ECM and cellular structures, the correct answer is 'a. cytoskeleton'.

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Key Concepts

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

cytoskeleton
The cytoskeleton is a network of protein filaments and tubules within the cell. It gives the cell its shape and mechanical resistance.
It is essential for various cellular functions such as:
  • Maintaining cell shape
  • Facilitating cell movement
  • Helping in cell division
The cytoskeleton is composed of three main types of protein fibers:
  • Microfilaments (actin filaments)
  • Intermediate filaments
  • Microtubules
Each type has a specific role. Microfilaments are involved in cell movement and structure, intermediate filaments provide mechanical support, and microtubules are responsible for vesicle transport and chromosome separation during cell division.
When the extracellular matrix (ECM) interacts with the cytoskeleton, it is typically through integrins.
This helps the cell sense and respond to environmental cues.
integrins
Integrins are transmembrane proteins that facilitate cell-ECM interactions. They act as bridges connecting the extracellular matrix to the cytoskeleton inside the cell.
Integrins have two primary functions:
  • Mediating cell adhesion
  • Transmitting signals between the cell and its environment
Integrins bind to specific proteins in the ECM, such as fibronectin or collagen. This binding not only anchors the cell but also allows it to sense changes in the ECM.
Consequently, integrins play a vital role in processes such as:
  • Cell migration
  • Wound healing
  • Tissue development
Through integrins, mechanical signals from the ECM are converted into chemical signals within the cell. This process is crucial for cellular responses and adaptations.
cellular structures
Cells are complex structures that contain various organelles and components. Each cellular structure has a specific function and contributes to the cell's overall operation.
Some key cellular structures include:
  • Nucleus: Contains the cell's genetic material and controls gene expression and replication.
  • Smooth Endoplasmic Reticulum (ER): Involved in lipid synthesis and detoxification processes.
  • Rough ER: Studded with ribosomes and plays a role in protein synthesis.
  • Mitochondria: Known as the powerhouse of the cell, they generate ATP through respiration.
  • Golgi Apparatus: Modifies, sorts, and packages proteins and lipids for secretion or use within the cell.
  • Lysosomes: Contain enzymes for digestion and waste processing.
Understanding these structures is crucial for comprehending cellular functions and interactions. Each structure's unique role allows cells to maintain homeostasis and respond to their environment effectively.

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Most popular questions from this chapter

Which element of the cell theory has practical applications in health care because it promotes the use of sterilization and disinfection? a. All cells come from pre-existing cells. b. All living organisms are composed of one or more cells. c. A cell is the basic unit of life. d. A nucleus and organelles are found in prokaryotic cells.

What are the advantages and disadvantages of light microscopes? What are the advantages and disadvantages of electron microscopes? a. Advantage: In light microscopes, the light beam does not kill the cell. Electron microscopes are helpful in viewing intricate details of a specimen and have high resolution. Disadvantage: Light microscopes have low resolving power. Electron microscopes are costly and require killing the specimen. b. Advantage: Light microscopes have high resolution. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes kill the cell. Electron microscopes are costly and low resolution. c. Advantage: Light microscopes have high resolution. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes can be used only in the presence of light and are costly. Electron microscopes uses short wavelength of electrons and hence have lower magnification. d. Advantage: Light microscopes have high magnification. Electron microscopes are helpful in viewing surface details of a specimen. Disadvantage: Light microscopes can be used only in the presence of light and have lower resolution. Electron microscopes can be used only for viewing ultra-thin specimens.

How does the structure of a plasmodesma differ from that of a gap junction? a. Gap junctions are essential for transportation in animal cells and plasmodesmata are essential for the movement of substances in plant cells. b. Gap junctions are found to provide attachment in animal cells and plasmodesmata are essential for attachment of plant cells. c. Plasmodesmata are essential for communication between animal cells and gap junctions are necessary for attachment of cells in plant cells. d. Plasmodesmata help in transportation and gap junctions help in attachment, in plant cells.

The major role of the cell wall in bacteria is protecting the cell against changes in osmotic pressure, pressure caused by different solute concentrations in the environment. Bacterial cells swell, but do not burst, in low solute concentrations. What happens to bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentrations? a. Bacterial cells will shrink due to the lack of cell wall material. b. Bacterial cells will shrink in size. c. Bacterial cells may burst due to the influx of water. d. Bacterial cells remain normal; they have alternative pathways to synthesize cell walls

In what situation, or situations, would the use of a light microscope be ideal? Why? a. A light microscope is used to view the details of the surface of a cell as it cannot be viewed in detail by the transmission microscope. b. A light microscope allows visualization of small living cells, which have been stained and cannot be viewed by scanning electron microscope. c. A standard light microscope is used to view living organisms with little contrast to distinguish them from the background, which would be harder to see with the electron microscope. d. A light microscope reveals the internal structures of a cell, which cannot be viewed by transmission electron microscopy.
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