ch13 - Chapter 13: Biochemical Signaling Multiple Choice 1....

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Chapter 13: Biochemical Signaling Multiple Choice 1. Which of the following proteins was the first G protein–coupled receptor to be structurally analyzed at the atomic level? A) glucagon B) somatostatin C) rhodopsin D) RasGAP E) guanine nucleotide exchange factor Ans: C Section: 13.3.A Level of Difficulty: easy Learning Objective: Heteromeric G Proteins 2. Insulin binds to a receptor that A) is coupled to a G protein. B) possesses tyrosine kinase activity. C) possesses serine/threonine phosphatase activity. D) migrates to the nucleus to affect transcription. E) activates MAP kinase. Ans: B Section: 13.2.B Level of Difficulty: easy Learning Objective: Receptor Tyrosine Kinases 3. Which of the following proteins is a phosphatase activated by Ca 2+ essential for T cell proliferation? A) calcineurin B) somatostatin C) rhodopsin D) RasGAP E) guanine nucleotide exchange factor Ans: A Section: 13.2.D Level of Difficulty: easy Learning Objective: Receptor Tyrosine Kinases 4. Proteins that bind molecules and elicit a response are called A) hormones B) secondary messengers 175
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C) receptors D) kinases E) lipases Answer: C Section: Intro Level of Difficulty: easy Learning Objective: Biochemical Signaling 5. The ability of receptors to adapt to long-term stimulation by responding to changes in stimulation rather than the level of stimulation is called A) dual-specificity B) signal transduction C) autoinhibition D) desensitization E) an emergent property Answer: D Section: 13.3.A Level of Difficulty: moderate Learning Objective: Heteromeric G Proteins 6. Viruses that cause cancer often carry A) oncogenes B) secondary messengers C) anabolic steroids D) cytokines E) interferons Answer: A Section: 13.2.B Level of Difficulty: easy Learning Objective: Receptor Tyrosine Kinases
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This note was uploaded on 12/05/2011 for the course CHEM 102 taught by Professor Cheng during the Spring '11 term at University of South Florida - Tampa.

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ch13 - Chapter 13: Biochemical Signaling Multiple Choice 1....

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