Podcast
Questions and Answers
Which of the following is NOT considered a chemical messenger in cellular communication?
Which of the following is NOT considered a chemical messenger in cellular communication?
- Growth factors
- Light (correct)
- Ions
- Odorants
Which type of messenger can diffuse across the plasma membrane and interact with cytosolic or nuclear receptors?
Which type of messenger can diffuse across the plasma membrane and interact with cytosolic or nuclear receptors?
- Chemical messengers
- Hydrophobic messengers (correct)
- Secondary messengers
- External messengers
What is the main function of cell surface receptors in cellular communication?
What is the main function of cell surface receptors in cellular communication?
- Trigger secondary events
- Mobilize intracellular second-messenger systems
- Ensure tight control of cell's response
- Receive chemical messengers (correct)
Which of the following is an example of a cell or tissue that produces hormones, despite not being classically thought of as endocrine in nature?
Which of the following is an example of a cell or tissue that produces hormones, despite not being classically thought of as endocrine in nature?
Which of the following is NOT a mode of intercellular communication mentioned in the text?
Which of the following is NOT a mode of intercellular communication mentioned in the text?
What is the function of acetylcholinesterase?
What is the function of acetylcholinesterase?
Which of the following is NOT a type of extracellular signaling molecule mentioned in the text?
Which of the following is NOT a type of extracellular signaling molecule mentioned in the text?
What is the function of a receptor in cell signaling?
What is the function of a receptor in cell signaling?
Which type of membrane signaling molecule acts as an enzyme or part of an enzymatic complex when activated by a ligand?
Which type of membrane signaling molecule acts as an enzyme or part of an enzymatic complex when activated by a ligand?
Which type of membrane signaling molecule is located in the cytosol or nucleus and functions as a ligand-activated transcription factor?
Which type of membrane signaling molecule is located in the cytosol or nucleus and functions as a ligand-activated transcription factor?
Which type of membrane signaling molecule alters the ion permeability of a cell by transiently opening its channel upon binding of a neurotransmitter?
Which type of membrane signaling molecule alters the ion permeability of a cell by transiently opening its channel upon binding of a neurotransmitter?
Which type of membrane signaling molecule works indirectly through a heterotrimeric G protein to activate or inactivate a separate membrane-associated enzyme or channel?
Which type of membrane signaling molecule works indirectly through a heterotrimeric G protein to activate or inactivate a separate membrane-associated enzyme or channel?
Which of the following is a mechanism by which cells can directly communicate with each other?
Which of the following is a mechanism by which cells can directly communicate with each other?
What is the function of second messengers in cell signaling?
What is the function of second messengers in cell signaling?
Which of the following is an example of a second messenger cascade?
Which of the following is an example of a second messenger cascade?
How do second-messenger systems allow specificity and diversity in cell signaling?
How do second-messenger systems allow specificity and diversity in cell signaling?
Which of the following is NOT a consequence of ligand binding to a receptor?
Which of the following is NOT a consequence of ligand binding to a receptor?
What is the role of gap junctions in cell-to-cell communication?
What is the role of gap junctions in cell-to-cell communication?
What is the physiological importance of modulation of gap junction permeability?
What is the physiological importance of modulation of gap junction permeability?
What is the role of β-catenin in adhering junctions?
What is the role of β-catenin in adhering junctions?
Which of the following is true about ligand-gated ion channels?
Which of the following is true about ligand-gated ion channels?
What is the structure of G protein-coupled receptors (GPCRs)?
What is the structure of G protein-coupled receptors (GPCRs)?
What is the stoichiometry of the nicotinic ACh receptor (AChR)?
What is the stoichiometry of the nicotinic ACh receptor (AChR)?
What is the main function of G proteins?
What is the main function of G proteins?
Which subunits of the βγ complex are involved in anchoring the complex to the membrane?
Which subunits of the βγ complex are involved in anchoring the complex to the membrane?
Which subunit of the βγ complex is held to the membrane by a myristyl or a palmitoyl group?
Which subunit of the βγ complex is held to the membrane by a myristyl or a palmitoyl group?
Which subunit of the βγ complex is held to the membrane by a prenyl group?
Which subunit of the βγ complex is held to the membrane by a prenyl group?
Which subunits of the βγ complex interact with different receptors and effectors?
Which subunits of the βγ complex interact with different receptors and effectors?
How many combinations of the known α, β, and γ subunits are there?
How many combinations of the known α, β, and γ subunits are there?
What is the main function of G proteins?
What is the main function of G proteins?
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