BIO Exam 2.docx - Exam 2 Fall 2015 1 Different body cells...

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Exam 2 Fall 2015 1. Different body cells can respond differently to the same peptide hormones because _____. A) different target cells have different sets of genes B) a target cell's response is determined by the components of its signal transduction pathways C) the circulatory system regulates responses to hormones by routing the hormones to specific targets D) the hormone is chemically altered in different ways as it travels through the circulatory system 2. Analysis of a blood sample from a fasting individual who had not eaten for twenty-four hours would be expected to reveal high levels of _____. For the following two (2) quesTons A=±rue, B=False 3. Lipid-soluble signaling molecules, such as testosterone, cross the membranes of all cells but affect only target cells because intracellular receptors are present only in target cells. True, because lipid-soluble signaling molecules have receptor cells within the nucleus therefore, they submit to an intracellular response hydrophilic are within the membrane as well 4. Conformational change in a signal-receptor complex that activates an enzyme is the first step in the process of signal transduction. True, the change in a signal-receptor complex is the very first step in signal transduction 5. Which of the following can act as a second messenger in a signal transduction cascade:
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Exam 2 Fall 2015 6. Which of the following statements best summarizes the acid-growth hypothesis in an actively growing shoot? 7. A population of plants experiences several years of severe drought. Much of the population dies due to lack of water, but a few individuals survive. You set out to discover the physiological basis for their adaptation to such an extreme environmental change. You hypothesize that the survivors have the ability to synthesize higher levels of _____ than their siblings do. A) auxin B) gibberellin C) cytokinin D) abscisic acid (drought tolerance and bud dormancy) 8. Although the membrane of a "resting" neuron is highly permeable to potassium ions, its membrane potential does not exactly match the equilibrium potential for potassium because the neuronal membrane is also _____.
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  • Fall '10
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