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Biosignaling 4 quiz

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  • What is crosstalk in cell signaling?
    Crosstalk refers to the interaction between different signaling pathways within a cell, which can modify the cellular response.
  • How does a guanylyl cyclase receptor function?
    A guanylyl cyclase receptor converts GTP to cyclic GMP in response to ligand binding, without the need for a G protein intermediate.
  • What is the main difference between adenylyl cyclase and guanylyl cyclase receptors?
    Adenylyl cyclase is activated by G proteins and converts ATP to cAMP, while guanylyl cyclase is directly activated by ligand binding and converts GTP to cGMP.
  • Which molecule activates cytosolic guanylyl cyclase?
    Nitric oxide activates cytosolic guanylyl cyclase.
  • What is the role of cyclic GMP in smooth muscle cells?
    Cyclic GMP activates protein kinase G, which influences smooth muscle contraction.
  • How does Viagra affect smooth muscle contraction?
    Viagra inhibits cyclic GMP phosphodiesterase, leading to increased levels of cyclic GMP and prolonged smooth muscle contraction in the veins.
  • What is the physiological effect of Viagra on blood flow?
    By inhibiting the breakdown of cyclic GMP, Viagra increases blood retention in the penis, resulting in an erection.
  • How do beta-adrenergic agonists help in asthma?
    Beta-adrenergic agonists raise cyclic AMP levels, which relaxes bronchial smooth muscle and opens the airways.
  • What is the effect of cyclic AMP on smooth muscle compared to cyclic GMP?
    Cyclic AMP relaxes smooth muscle, while cyclic GMP stimulates smooth muscle contraction.
  • What are integrins and what is their function?
    Integrins are adhesion receptors that link the cytoskeleton to the extracellular matrix, allowing cells to change shape and form.
  • How do integrins influence cell structure?
    By binding to the cytoskeleton and extracellular matrix, integrins can cause cells to change their shape and form.
  • Where are steroid hormone receptors typically located?
    Steroid hormone receptors are usually located inside the cell, either in the cytoplasm or the nucleus.
  • Why can steroid hormones diffuse through the cell membrane?
    Steroid hormones are lipid soluble, allowing them to easily diffuse through the cell membrane.
  • What is the general function of steroid hormone receptors after binding their ligand?
    Steroid hormone receptors often act as transcription factors, regulating gene expression in the nucleus.
  • How do steroid hormone receptors regulate gene expression?
    After binding their ligand, steroid hormone receptors dimerize and bind to DNA, influencing the transcription of specific genes.