Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 9, Problem 9RQ
A scientist notices that when she adds a small, water-soluble molecule to a dish of cells, the cells turn off transcription of a gene. She hypothesizes that the ligand she added binds to a(n)____receptor.
- Intracellular
- Hormone
- Enzyme-linked
- Gated ion channel-linked
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Paracrine signaling is characterized by ligands that are __________.
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Whether the statement "most intracellular signaling pathways provide numerous opportunities for amplifying the responses to extracellular signals" is true or false.
After it has been activated a G-protein _______.
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binds to a receptor on a nearby cell and then activates multiple proteins
Chapter 9 Solutions
Biology 2e
Ch. 9 - Figure 9.8 HER2 is a receptor tyrosine kinase. In...Ch. 9 - Figure 9.10 In certain cancers, the GTPase...Ch. 9 - Figure 9.17 Which of the following statements...Ch. 9 - Figure 9.18 What advantage might biofilm...Ch. 9 - What property prevents the ligands of cell-surface...Ch. 9 - The secretion of hormones by the pituitary gland...Ch. 9 - Why are ion channels necessary to transport ions...Ch. 9 - Endocrine signals are transmitted more slowly than...Ch. 9 - A scientist notices that when she adds a small,...Ch. 9 - Where do DAG and IP3 originate? They are formed by...
Ch. 9 - What property enables the residues of the amino...Ch. 9 - Histamine binds to the H1 G-protein-linked...Ch. 9 - A scientist observes a mutation in the...Ch. 9 - What is the function of a phosphatase? A...Ch. 9 - How does NF-kB induce gene expression? A small,...Ch. 9 - Apoptosis can occur in a cell when the cell is...Ch. 9 - What is the effect of an inhibitor binding an...Ch. 9 - How does PKC’s signaling role change in response...Ch. 9 - A scientist notices that a cancer cell line fails...Ch. 9 - Which type of molecule acts as a signaling...Ch. 9 - Quorum sensing is triggered to begin when...Ch. 9 - A doctor is researching new ways to treat biofilms...Ch. 9 - What is the difference between intracellular...Ch. 9 - How are the effects of paracrine signaling limited...Ch. 9 - What are the differences between internal...Ch. 9 - Cells grown in the laboratory are mixed with a dye...Ch. 9 - Insulin is a hormone that regulates blood sugar by...Ch. 9 - The same second messengers are used in many...Ch. 9 - What would happen if the intracellular domain of a...Ch. 9 - If a cell developed a mutation in its MAP2K1 gene...Ch. 9 - What is a possible result of a mutation in a...Ch. 9 - How does the extracellular matrix control the...Ch. 9 - A scientist notices that a cancer cell line shows...Ch. 9 - What characteristics make yeasts a good model for...Ch. 9 - Why is signaling in multicellular organisms more...Ch. 9 - Pseudomonas infections are very common in hospital...
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- Figure 9.8 HER2 is a receptor tyrosine kinase. In 30 percent of human breast cancers, HER2 is permanently activated, resulting in unregulated cell division. Lapatinib, a drug used to treat breast cancer, inhibits HER2 receptor tyrosine kinase autophosphorylation (the process by which the receptor adds phosphates onto itself), thus reducing tumor growth by 50 percent. Besides autophosphorylation, which of the following steps would be inhibited by Lapatinib? Signaling molecule binding, dimerization, and the downstream cellular response. Dimerization, and the downstream cellular response. The downstream cellular response. Phosphatase activity, dimerization, and the downsteam cellular response.arrow_forwardSteroid hormones ______. bind to receptors in the cytoplasm or nucleus trigger a signal transduction pathway when they bind to a receptor bind to mRNA in the cytoplasm to initiate transcription all of the abovearrow_forwardHistamine is a chemical substance released in inflammatory and allergic response. The histamine H1 receptor is a G protein-coupled receptor that activates phospholipase C in response to the binding of histamine. Arrange the data below showing the process of histamine signal transduction from the H1 receptor. Calcium ions flow through ligand-gated ion channel. Phosphorylation cascade leads to the activation of a cellular response. Calcioum ions activate a protein, leading to a cellular response. Enzyme cleaves PIP2, forming DAG and IP3. Calcium iom concentration increases in the cytosol. IP3 binds to a ligand-gated ion channel in thw ER membrane.arrow_forward
- Intracellular signaling pathways provide multiple opportunities for the amplification of a response to an extracellular signal. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True Falsearrow_forwardCell signaling involves only one molecule, the receptor. True Falsearrow_forwardG-protein coupled receptors have a GTP-binding domain. True Falsearrow_forward
- Name 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_forwardCompare and contrast signaling via G-protein coupled receptor, receptor tyrosine kinases, nuclear receptor. Please name at least one ligand/receptor for each pathway. Also describe the 'fast' and 'slow' responses mediated by ligand bindingarrow_forwardWhich of the following is the best description of how a G protein coupled receptor responds to a ligand binding? O Binding of ligand to the receptor causes the G protein to swap out GTP for GDP Binding of ligand to the receptor causes the G proteins to dimerize and trigger cross-phosphorylation Binding of ligand to the receptor causes the G protein to become activated, then the G protein travels through the plasma membrane to activate an enzyme Binding of ligand to the G protein triggers it to swap out GDP for GTP, causing it to become activated OOO Oarrow_forward
- You find a monster that produces a hormone that uses standard G-protein receptor pathways to prepare the creature for lunch. Outline two signaling pathways used by the hormone when binding to a receptor, and indicate how you might modify the monsters cells so it doesn’t eat you. (how would you block each of the pathways by blocking production of a component?).arrow_forwardProgesterone is a steroid hormone that is produced by the placenta during pregnancy. Based on its structure (shown below), explain why progesterone’s effects are mediated by a receptor located inside the cell rather than on the cell membrane.arrow_forwardIntracellular signaling via ___________ is the primary mechanism of action for water-soluble hormones. Group of answer choices second messengers diffusion through plasma membrane intracellular receptorsarrow_forward
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