Quiz for Chapter 11 & 12

1659 WordsOct 17, 20127 Pages
1. Paracrine signaling A) involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid. B) requires nerve cells to release a neurotransmitter into the synapse. C) occurs only in paracrine yeast cells. D) has been found in plants but not animals. E) involves mating factors attaching to target cells and causing production of new paracrine cells. 2. Which of the following is true of synaptic signaling and hormonal signaling? A) Hormonal signaling occurs in animals only. B) Hormonal signaling is important between cells that are at greater distances apart than in synaptic signaling. C) Both act on target cells by a G-protein-signaling pathway. D) Only A and B are…show more content…
24. What are the three stages of cell signaling? Reception, transduction, response. 25. Describe where receptors for water-soluble and lipid soluble signal molecules are located. For example, receptors for ________ signal molecules are typically on the exterior of the plasma membrane. water-soluble, on the exterior of the plasma membrane; lipid-soluble, inside the cell. 26. What are the two main advantages of using a multistep pathway in the transduction stage of cell signaling? signal amplification and regulation/control 27. Compare kinases and phosphatases in terms of phosphorylation. kinases phosphorylate another molecule; phosphatases dephosphorylate another molecule. Objective 2-5 1) The centromere is a region in which A) chromatids are attached to one another. B) metaphase chromosomes become aligned. C) chromosomes are grouped during telophase. D) the nucleus is located prior to mitosis. E) new spindle microtubules form. 2) What is a chromatid? A) a chromosome in G1 of the cell cycle B) a replicated chromosome C) a chromosome found outside the nucleus D) a special region that holds two centromeres together E) another name for the chromosomes found in genetics 3) What is the name for the special region on a duplicated chromosome that holds the sister chromatids together? A) centrosome B) centromere C)

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