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Chapter 9: Problem 20

What is the difference between intra cellular signaling and inter cellular signaling? a. Intra cellular signaling occurs between cells of two different species. Inter cellular signaling occurs between two cells of the same species. b. Intra cellular signaling occurs between two cells of same species. Inter cellular signaling occurs between cells of two different species. c. Intra cellular signaling occurs within a cell. Inter cellular signaling occurs between cells. d. Intra cellular signaling occurs between cells. Inter cellular signaling occurs within cell.

Short Answer

Expert verified
Option c is correct: Intra cellular signaling occurs within a cell. Inter cellular signaling occurs between cells.

Step by step solution

01

- Understand Key Terms

Identify and understand the key terms: 'intra cellular' and 'inter cellular'. 'Intra' means 'within', while 'inter' means 'between'.
02

- Define Intra Cellular Signaling

Intra cellular signaling refers to communication that occurs within a single cell. This involves the transmission of signals inside the same cell.
03

- Define Inter Cellular Signaling

Inter cellular signaling refers to communication that occurs between two or more cells. This involves the transmission of signals from one cell to another.
04

- Compare Definitions

Compare the definitions to the given choices to identify which matches our understanding. 'Intra cellular' is within a single cell, 'Inter cellular' is between different cells.
05

- Choose the Correct Answer

Based on our definitions, option c: 'Intra cellular signaling occurs within a cell. Inter cellular signaling occurs between cells.' is correct.

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Key Concepts

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

Intracellular Signaling
Intracellular signaling occurs inside a single cell. It involves the transmission of signals within that cell to carry out specific functions. For example, when a cell receives a signal from outside, such as a hormone, it must relay this signal internally to trigger an appropriate response. This process can involve a series of biochemical reactions and the activation of various proteins.
Key components of intracellular signaling include:
  • Receptors 鈥� These are proteins on the cell surface or within the cell that bind to signaling molecules.
  • Second Messengers 鈥� Small molecules within the cell that help relay the signal.
  • Protein Kinases 鈥� Enzymes that modify other proteins by adding phosphate groups, thereby altering their activity.

Intracellular signaling ensures that cells can respond promptly to changes in their environment. It effectively coordinates various activities within the cell to maintain homeostasis and support its function.
Intercellular Signaling
Intercellular signaling involves communication between two or more cells. This is a crucial mechanism by which cells coordinate their actions and maintain the appropriate function of tissues and organs. For example, nerve cells communicate with muscle cells to control movement.
Types of intercellular signaling include:
  • Autocrine signaling 鈥� A cell targets itself, releasing signals that bind to receptors on its own surface.
  • Paracrine signaling 鈥� A cell targets a nearby cell, releasing signals into the surrounding environment.
  • Endocrine signaling 鈥� Signals (often hormones) are released into the bloodstream, influencing distant cells.
  • Direct signaling 鈥� Cells communicate through direct contact with each other via gap junctions or other types of cell junctions.

This signaling ensures that cells work together efficiently and respond to the body鈥檚 needs in a coordinated manner.
Cell Communication
Cell communication is the process by which cells detect, process, and respond to signals in their environment. It encompasses both intracellular and intercellular signaling. Effective communication is vital for the survival of cells and the organism as a whole.
Components of cell communication include:
  • Signaling Molecules 鈥� These include hormones, neurotransmitters, and other chemical messengers that convey information.
  • Receptors 鈥� Proteins on the cell surface or inside the cell that detect signaling molecules.
  • Signaling Pathways 鈥� Series of chemical reactions that lead to a specific cellular response.

Through these components, cells can regulate their growth, division, and death; respond to environmental changes; and coordinate their activities with other cells. Overall, understanding cell signaling helps us comprehend how cells interact and maintain the complex functions of life.

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Most popular questions from this chapter

Which type of molecule acts as a signaling molecule in yeasts? a. auto inducer b. mating factor c. second messenger d. steroid

Cancer cells that continue to divide when defective often show changes in what cellular function? a. apoptosis b. their mechanism of glycolysis c. the mechanism of protein biosynthesis d. replication of DNA

The R A S protein is a G-protein connected with the response to RTKs that initiates the M A P K kinase cascade when GDP is released and G T P uploaded. Mutations in the R A S protein which interfere with its GTPase activity are common in cancer. Evaluate the connection between the inability of R A S to hydrolyze G T P and uncontrolled cell proliferation. a. R A S, when bound to G T P, becomes permanently inactive even in the presence of the ligand, and no longer regulates cell division. b. R A S, when bound to G T P, becomes permanently active even in the absence of the ligand, and no longer regulates cell division. c. R A S, when bound to G T P, forms a dimer after binding to the ligand, and causes uncontrolled division, but it remains inactive when the ligand is absent. d. R A S, when bound to G T P, does not form a dimer after binding to the ligand but stimulates downstream signaling to occur and causes uncontrolled cell division.

Bio films are a prominent danger in infectious disease treatment today because it is difficult to find drugs that can penetrate the bio film. What characteristics would a drug have if it aimed to prevent bacteria from forming bio films in the first place? Explain your answer. 32. Support the hypothesis that signaling pathways appeared early in evolution and are well-conserved using the yeast mating factor as an example. a. Signaling in yeast uses the R T K pathway and is evolutionarily conserved, like insulin signaling in humans. b. Signaling in yeast uses G-protein coupled receptors for signaling and is evolutionarily conserved, like insulin signaling in humans. c. Signaling in yeast uses an endocrine pathway and is evolutionarily conserved, like insulin signaling in humans. d. Mating factor in yeast uses an auto crine signaling pathway and is evolutionarily conserved.

How does the extracellular matrix control the growth of cells? a. Contact of receptors with the extracellular matrix maintains equilibrium of the cell and provides optimal pH for the growth of the cells. b. Contact of the receptor with the extracellular matrix helps maintain concentration gradients across membrane, resulting in the flow of ions. c. The extracellular matrix provides nutrients for the cell. d. The extracellular matrix connects the cell to the external environment and ensures correct positioning of the cell to prevent metastasis.
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