Chapter 5.6 Reading Guide Quiz (AP BIO)

Why are signal transduction pathways important?

• Cells must be able to detect and bring in available environmental nutrients

• The cell must "know" when to divide or die (apoptosis)

• During development, stem cells have to "know" which type of mature cell to become (differentiate into various tissues)

• Cells have to know when and which types of proteins to make

• All of these are reasons why cells must use signal transduction pathways

The first step in any signal transduction pathway is the Signaling phase where a ligand is released due to an environmental change. What are the next three steps in correct order?

• Reception -> Transduction -> Response

• Transduction -> Reception -> Response

• Response -> Reception -> Transduction

• Reception -> Response -> Transduction

Which of the following best describes the Response phase of a Signal Transduction Pathway

• Binding or Absorption of a chemical signal (ligand) by target cell

• The release of a chemical signal in response to an environmental change

• The transmission of the signal through the target cell

• The action taken by the target cell following the signaling pathway

Which of the following best describes the Reception phase of a Signal Transduction Pathway

• Binding or Absorption of a chemical signal (ligand) by target cell

• The release of a chemical signal in response to an environmental change

• The transmission of the signal through the target cell

• The action taken by the target cell following the signaling pathway

Which of the following best describes the Transduction phase of a Signal Transduction Pathway

• Binding or Absorption of a chemical signal (ligand) by target cell

• The release of a chemical signal in response to an environmental change

• The transmission of the signal through the target cell

• The action taken by the target cell following the signaling pathway

Which of the following best describes a Ligand

• The protein which binds to a Ligand and begins a signaling pathway within the target cell

• The structure which is activated within a target cell to pass on an intracellular signal

• The specific chemical messenger which is released in response to an environmental stimulus

• The main components of a cell membrane. Contain both a hydrophobic and hydrophilic portion

Which of the following best describes a Receptor

• The protein which binds to a Ligand and begins a signaling pathway within the target cell

• The structure which is activated within a target cell to pass on an intracellular signal

• The specific chemical messenger which is released in response to an environmental stimulus

• The main components of a cell membrane. Contain both a hydrophobic and hydrophilic portion

Which of the following is NOT true of Receptors

• They are always found on the surface of the target cell embedded within the cell membrane

• They are proteins

• They show specificity due to their unique structure and can only bind to Ligands with a complimentary structure to them

• All of these are true

Which of the following best describes why some receptors are found inside of the target cell and not displayed on their surface?

• Some ligands are small and nonpolar

• Some ligands are large and polar

• Some ligands generate multiple responses when they bind to the receptor

• Some receptors are unable to completely leave the target cell

What is the role of an ion channel

• To regulate the movement of charged particles across a barrier

• To serve as the primary messenger within a signal transduction pathway

• To serve as the secondary messenger within a signal transduction pathway

• To facilitate a phosphorylation cascade