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?
- Ions
- Light (correct)
- Odorants
- Steroid hormones
What is the role of cell surface receptors in cellular communication?
What is the role of cell surface receptors in cellular communication?
- Diffuse across the plasma membrane
- Receive and process external signals (correct)
- Transduce hydrophobic messengers
- Trigger secondary events
Which of the following is an example of a hydrophobic messenger in cellular communication?
Which of the following is an example of a hydrophobic messenger in cellular communication?
- Growth factors
- Steroid hormones (correct)
- Ions
- Odorants
What is the purpose of intracellular signaling pathways in cellular communication?
What is the purpose of intracellular signaling pathways in cellular communication?
Which of the following is a mechanism by which cells can directly communicate?
Which of the following is a mechanism by which cells can directly communicate?
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 ligands that activate the same signaling pathways in cells usually produce the same effect?
How do ligands that activate the same signaling pathways in cells usually produce the same effect?
Which of the following is NOT one of the three ways intercellular communication can occur?
Which of the following is NOT one of the three ways intercellular communication can occur?
What is the role of acetylcholinesterase in paracrine signaling at the neuromuscular junction?
What is the role of acetylcholinesterase in paracrine signaling at the neuromuscular junction?
Which of the following is NOT a type of extracellular signaling molecule?
Which of the following is NOT a type of extracellular signaling molecule?
What are effectors in signal transduction?
What are effectors in signal transduction?
Which type of receptor is involved in signaling between electrically excitable cells and results in transient opening of the channel when a neurotransmitter binds to it?
Which type of receptor is involved in signaling between electrically excitable cells and results in transient opening of the channel when a neurotransmitter binds to it?
Which type of receptor works indirectly through an intermediary called a G protein to activate or inactivate a separate membrane-associated enzyme or channel?
Which type of receptor works indirectly through an intermediary called a G protein to activate or inactivate a separate membrane-associated enzyme or channel?
Which type of receptor, when activated by a ligand, can either be enzymes themselves or part of an enzymatic complex?
Which type of receptor, when activated by a ligand, can either be enzymes themselves or part of an enzymatic complex?
Which type of receptor, located in the cytosol or nucleus, is ligand-activated and links extracellular signals to gene transcription?
Which type of receptor, located in the cytosol or nucleus, is ligand-activated and links extracellular signals to gene transcription?
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?
Which of the following is true about adhering junctions?
Which of the following is true about adhering junctions?
What is the role of tight junctions in the diffusion barrier?
What is the role of tight junctions in the diffusion barrier?
Which of the following is a characteristic of ligand-gated ion channels?
Which of the following is a characteristic of ligand-gated ion channels?
What is the function of G proteins in signal transduction?
What is the function of G proteins in signal transduction?
What is the structure of G protein-coupled receptors (GPCRs)?
What is the structure of G protein-coupled receptors (GPCRs)?
Which of the following is a characteristic of heterotrimeric G proteins?
Which of the following is a characteristic of heterotrimeric 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?
What holds the α subunit to the membrane?
What holds the α subunit to the membrane?
What holds the γ subunit to the membrane?
What holds the γ subunit to the membrane?
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 do G proteins link together?
What do G proteins link together?
What are the multiple classes of G proteins suited for?
What are the multiple classes of G proteins suited for?
