EBK CAMPBELL BIOLOGY
10th Edition
ISBN: 9780136539414
Author: Reece
Publisher: VST
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Chapter 11.2, Problem 1CC
Nerve growth factor (NGF) is a water-soluble signaling molecule. Would you expect the receptor for NGF to be intracellular or in the plasma membrane? Why?
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An extracellular signaling molecule binds to cell surface receptor. This cell surface receptor changes shape and activates a trimeric G-protein. What kind of receptor is this?
a) Ion-channel coupled receptor
b) Receptor Tyrosine Kinase
c) G-Protein coupled receptor
d) All of the other answers are correct
e) Enzyme-coupled receptor
Describe the functions of various components of intracellular signaling pathways with diagrams. Explain the three classes of cell-surface receptors.
Nerve growth factor (NGF) is a water-soluble signalingmolecule. Would you expect the receptor for NGF to beintracellular or in the plasma membrane? Why?
Chapter 11 Solutions
EBK CAMPBELL BIOLOGY
Ch. 11.1 - Explain how signaling is involved in ensuring that...Ch. 11.1 - In liver cells, glycogen Phosphorylase acts in...Ch. 11.1 - Prob. 3CCCh. 11.2 - Nerve growth factor (NGF) is a water-soluble...Ch. 11.2 - WHAT IF? What would the effect be if a cell made...Ch. 11.2 - MAKE CONNECTIONS How is ligand binding similar to...Ch. 11.2 - Prob. 4CCCh. 11.3 - What is a protein kinase, and what is its role in...Ch. 11.3 - When a signal transduction pathway involves a...Ch. 11.3 - What is the actual signal that is being transduced...
Ch. 11.3 - WHAT IF? If you exposed a cell to a ligand that...Ch. 11.4 - How can a targct cell's response to a single...Ch. 11.4 - WHAT IF? If two cells have different scaffolding...Ch. 11.4 - Prob. 3CCCh. 11.5 - Give an example of apoptosis during embryonic...Ch. 11.5 - WH AT IF? If apoptosis occurred when it should...Ch. 11 - What determines whether a cell responds to a...Ch. 11 - How are the structures of a GPCR and an RTK...Ch. 11 - What is the difference between a protein kinase...Ch. 11 - What mechanisms in the cell terminale its response...Ch. 11 - What is an explanation for the similarities...Ch. 11 - Binding of a signaling molecule to which type of...Ch. 11 - The activation of receptor tyrosinc kinases is...Ch. 11 - Lipid-soluble signaling molecules, such as...Ch. 11 - Consider this pathway: epinephrine G...Ch. 11 - Apoptosis involves all but which of the following?...Ch. 11 - Which Observation suggestcd to Sutherland the...Ch. 11 - Protein phosphorylation is commonly involved with...Ch. 11 - DRAW IT Draw the following apoptotic pathway,...Ch. 11 - EVOLUTION CONNECTION Identify the evolutlonary...Ch. 11 - Prob. 10TYUCh. 11 - SCIENCE, TECHNOLOGY, AND SOCIETY The aging process...Ch. 11 - WRITE ABOUT A THEME: ORGANIZATION The properties...Ch. 11 - SYNTHESIZE YOUR KNOWLEDGE There are five basic...
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- Outline the three general means by which binding of a water soluble extracellular chemical messenger to its matching surface membrane receptor brings about the desired intracellular response.arrow_forwardWhat is the sequence of events that takes place in cell signaling?arrow_forwardWhen activated extracellularly, G protein-coupled receptors (GPCRs) initiate which of the following? (select all that apply) a G protein signaling mechanism inside the cell. b) A G protein signaling mechanism outside the cell. c) Transporters to uptake degraded neurotransmitters for recycling. d) The release of neurotransmitter molecules into the postsynaptic cell.arrow_forward
- A mutated form of the α subunit of the heterotrimeric G protein has been identified; this form readily exchanges nucleotides even in the absence of an activated receptor. What would be the effect on a signaling pathway containing the mutated α subunit?arrow_forwardThe G protein coupled receptor (GPCR) pathway elicits diverse intracellular responses in different cells. The basic steps of GPCR signaling are outlined in this diagram. Which of the following statements correctly describes the process of GPCR signaling? The GPCR activation is reversible after the signal of the ligand diminishes. The membrane-embedded enzyme uses GTP as a secondary messenger to initiate gene expression. The ligand attaches to both the GPCR and the membrane-embedded enzyme to activate the GPCR pathway. The ligand-bound GPCR sends a GTP molecule to an enzyme in the membrane and switches it into an active state.arrow_forwardIt is important for the cell to be able to terminate responses, and diminish responsiveness to prevent overstimulation. Cells have different mechanisms for this. One such mechanism is receptor down regulation. a.) Down regulation describes a decrease in the availability of hormones or neurotransmitters that bind to receptors on the surface of target cells, making the cells less likely to be stimulated. b.) Down regulation describes glycosylation of receptor proteins receptors on the surface of target cells in order to decrease the selectivity of ligand binding, making the cells less sensitive to a hormone or neurotransmitter. c.) Down regulation describes a decrease in the number of receptors on the surface of target cells, making the cells less sensitive to a hormone or neurotransmitter.arrow_forward
- Suppose that a G protein undergoes a mutation that allows the exchange of bound GTP for GDP to occur in the absence of G protein binding to a receptor. How might this mutation affect signaling involving a GPCR? Which subunit of the G protein is most likely affected by the mutation?arrow_forwardContinuous exposure of a Gαs protein coupled receptor to its ligand leads to a phenomenon known as desensitization. Describe several molecular mechanisms for receptor desensitization. How can a receptor be reset to its original sensitized state? What effect would a mutant receptor lacking serine or threonine phosphorylation sites have on a cell?arrow_forwardName three features common to the activation of cytokine receptors and receptor tyrosine kinases. Name one difference with respect to the enzyme activity of these receptors.arrow_forward
- Cellular signaling follows a cascade of events and has multiple points of regulation. Which of the following could be a reason(s) why a signalling cascade is interrupted, or turned 'off', once it has been turned 'on'? A) a protein gets tagged with an ubiqutin group and gets degraded B) a chemical modification occurred on serine, threonine, or tyrosine side chains to turn on/off proteins C) allosteric regulation causes an active site to be hidden D) All of the other answers are correct E) The ligand is prevented from reaching the binding sitearrow_forwardIn intercellular signaling pathways, some receptor proteins can also act as a transcription factor (changing gene expression), because these receptors are ________. A) Group of answer choices B) Intracellular receptors C) Membrane bound receptors D) G protein coupled receptors E) Enzyme linked receptors F) Fast ligand-gated ion channelsarrow_forwardActivation of certain GPCRs triggers an intracellular signaling mechanism that involves activation of adenlyl cyclase and an increase of cAMP. Which of the following statements best describes the the events that follow such a cAMP increase? a.) The cAMP increase leads to activation of protein kinase C. b.) The cAMP increase leads to activation of the release of the gamma subunit from the GPCR. c.) The cAMP increase leads to activation of protein kinase A.arrow_forward
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