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11 - Biology 8e(Campbell Chapter 11 Cell Communication...

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Biology, 8e (Campbell) Chapter 11 Cell Communication Multiple-Choice Questions 1) In the yeast signal transduction pathway, after both types of mating cells have released the mating factors and the factors have bound to specific receptors on the correct cells, A) binding induces changes in the cells that lead to cell fusion. B) the cells then produce the a factor and the factor. C) one cell nucleus binds the mating factors and produces a new nucleus in the opposite cell. D) the cell membranes fall apart, releasing the mating factors that lead to new yeast cells. E) a growth factor is secreted that stimulates mitosis in both cells. Answer: A Topic: Concept 11.1 Skill: Knowledge/Comprehension 2) Which of the following is true of the mating signal transduction pathway in yeast? A) The pathway carries an electrical signal between mating cell types. B) Mating type a secretes a signal called a factor. C) The molecular details of the pathway in yeast and in animals are very different. D) Scientists think the pathway evolved long after multicellular creatures appeared on Earth. E) The signal reception, transduction, and response occur in the nucleus. Answer: B Topic: Concept 11.1 Skill: Knowledge/Comprehension 3) What could happen to the target cells in an animal that lack receptors for local regulators? A) They could compensate by receiving nutrients via an a factor. B) They could develop normally in response to neurotransmitters instead. C) They could divide but never reach full size. D) They would not be able to multiply in response to growth factors from nearby cells. E) Hormones would not be able to interact with target cells. Answer: D Topic: Concept 11.1 Skill: Knowledge/Comprehension 4) Paracrine signaling 1
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5) From the perspective of the cell receiving the message, the three stages of cell signaling are
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