Exam 4 Version 1 KEY

Exam 4 Version 1 KEY - Biology 181R Sections 5 6H Brian...

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Biology 181R Sections 5, 6H Brian Larkins and Ramin Yadegari Hour Exam #4 December 5, 2009 (Version 1 Key) LAST NAME: _____________________ FIRST NAME:__________________________ UA NET ID: ___________________ Instructions: Before starting this exam, read the Instructions! Fill in your name and NetID on both the exam booklet and the bubble sheet. Circle your answer on the exam copy AND use a #2 pencil to mark the corresponding answer on the bubble sheet. If you must change an answer, be certain that your first choice is erased completely. The bubble sheet is your “official” answer sheet! Read each question carefully and choose THE BEST answer. If you are unclear regarding what the question is asking, raise your hand and ask for clarification. When you have finished the exam, turn in both the bubble sheet and the exam book to the instructor at the front of the room. There are multiple versions of this exam. DO NOT LET YOUR EYES WANDER FROM YOUR EXAM! If you violate the code of academic integrity, you will be subject to sanctions such as loss of credit for this exam and possibly being assigned a failing grade for the course. 1. From the perspective of the cell receiving the message, the three stages of cell signaling are _____________. a. the paracrine, local, and synaptic stages *b. signal reception, signal transduction, and cellular response c. signal reception, nucleus disintegration, and new cell generation d. signal reception, cellular response, and cell division e. paracrine, autocrine and endocrine stages 2. Cells use different signaling strategies to achieve different goals. In hormonal (endocrine) signaling ___________________. a. numerous cells can receive and respond to a signal produced in their vicinity b. special molecules are passed through cell junctions c. the signal can be directed to a very specific target because a narrow space separates the target cell from the transmitting cell *d. specialized cells release hormone molecules into the circulatory system, permitting distant cells to be affected e. None of these. 3. Which of the following chemical messengers pass through the plasma membrane of cells and have receptor molecules in the cytoplasm? *a. testosterone b. insulin c. cAMP d. GTP e. epinephrine
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4. The source of phosphate for a phosphorylation cascade is ______________. a. cAMP b. protein kinase c. protein phosphatase *d. ATP e. GDP 5. Which of the following is activated when the binding of signal molecules causes it to form a dimer? a. ion-channel receptors b. G-protein receptors *c. protein kinase receptors d. protein phosphatase receptors e. adenylyl cyclase receptors 6. Which of the following statements is true? a. When a ligand binds a G-protein linked receptor, the G protein associated with the receptor is phosphorylated and becomes active. b. Local regulators bind their receptors and are internalized by endocytosis, triggering the cell’s
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This note was uploaded on 03/19/2011 for the course MCB 181R taught by Professor Leonard during the Spring '08 term at Arizona.

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Exam 4 Version 1 KEY - Biology 181R Sections 5 6H Brian...

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