test_chapter11

test_chapter11 - Chapter 11: Cell Communication MULTIPLE...

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Chapter 11: Cell Communication MULTIPLE CHOICE 1) In yeast ( Saccharomyces cerevisiae ), the two sexes are called A) S plus and S minus. B) a and . C) a and b. D) b and . E) male and female. ANS: B PTS: 1 TOP: Concept 11.1 2) 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. ANS: A PTS: 1 TOP: Concept 11.1 3) 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. ANS: B PTS: 1 TOP: Concept 11.1 4) 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. ANS: D PTS: 1 TOP: Concept 11.1 5) 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. ANS: A PTS: 1 TOP: Concept 11.1 6) Which of the following is true of synaptic signaling and hormonal signaling? A) Hormonal signaling occurs in animals only.
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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 true. E) A, B, and C are true. ANS: B PTS: 1 TOP: Concept 11.1 7) The old saying "one rotten apple spoils the whole barrel" is due to chemical signaling in plants via A) an increased uptake of carbon dioxide during respiration in target cells. B)
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test_chapter11 - Chapter 11: Cell Communication MULTIPLE...

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