d103 iclicker+question+Lect+16-18

d103 iclicker+question+Lect+16-18 - Which has no direct...

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iClicker question #1 Which of the following statements is FALSE? 1) Signal transduction is essential for cells to maintain normal development and homeostasis. 2) Extracellular signal can only be transduced by cell surface membrane receptors. 3) Small and hydrophobic stimuli such as steroids can directly penetrate plasma membrane, while hydrophilic stimuli can not penetrate plasma membrane directly. 4) None of the above. Ans: 2 Lecture 16
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Iclicker question #2 Which type of signaling best describes hormone signaling? A. Contact-dependent signaling B. Autocrine signaling C. Endocrine signaling D. Synaptic signaling E. Paracine signaling Lecture 16 Ans: C
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iClicker question #1 Which of the following mechanisms can not terminate the intracellular signaling pathway? A. sequestering receptors by internalization B. Inhibition of a negative feedback loop C. deactivation of a signal transduction protein D. degradation of receptors E. none of the above Lecture 17 Ans: B
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Unformatted text preview: Which has no direct effect on regulation of cellular PKA activity? A. expression level of AKAPs B. level of adenylyl cyclase activity C. increased cytosolic concentration of cAMP D. decreased cytosolic concentration of ADP E. level of cAMP phosphodiesterase activity iClicker question #2 Lecture 17 Ans: D Which of the following is not involved in regulation of cAMP concentration? A. Gs α-coupled receptor B. AKAPs C. Gi α-coupled receptor D. modulation of cAMP phosphodiesterase activity E. activity of guanylyl cyclase Iclicker question #1 Lecture 18 Ans: E Which of the following steps determines the inactivation of activated G-proteins? A. When the GPCR releases its ligand. B. When the alpha subunit has exchanged GDP for GTP C. When the activated βγ subunits have inhibited their target ion channel receptor. D. Hydrolysis of bound GTP E. None of the above. Iclicker question #2 Lceture 18 Ans: D...
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This note was uploaded on 02/21/2009 for the course BIOL 05400 taught by Professor Taagepera,s during the Spring '09 term at UC Irvine.

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d103 iclicker+question+Lect+16-18 - Which has no direct...

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