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New Microsoft Word Document (2) - 1 In yeast(Saccharomyces...

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1) In yeast (Saccharomyces cerevisiae), the two sexes are called A) b and beta. B) a and alpha. C) a and b. D) S plus and S minus. E) male and female. 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) one cell nucleus binds the mating factors and produces a new nucleus in the opposite cell. C) the cells then produce the a factor and the alpha factor. D) the cell membranes fall apart, releasing the mating factors that lead to new yeast cells. 3) Which of the following is true of the mating signal-transduction pathway in yeast? A) Scientists think the pathway evolved long after multicellular creatures appeared on Earth. B) The pathway carries an electrical signal between mating cell types. C) Mating type a secretes a signal called a factor. D) The molecular details of the pathway in yeast and in animals are very different. 4) Which of the following responses would be expected in myxobacteria when nutrients are scarce? A) Cells would cannibalize each other unless they secrete a chemical signal telling the other myxobacteria they are alike. B) Cells secrete an a-factor and an alpha-factor signal that releases new nutrients. C) Starving cells secrete a chemical signal that simulates other cells to aggregate in the soil and form spores. D) The starved cells secrete a signal to other cells that it is time to move to another environment. E) Both C and D are expected responses. 5) What could happen to target cells in an animal that lack receptors for local regulators? A) They would divide but could never reach full size. B) They would not be expected to multiply in response to growth factors from nearby cells. C) They could develop normally in response to neurotransmitters instead. D) They could compensate by receiving nutrients via an a factor. E) Hormones would not be able to interact with target cells. 6) Paracrine signaling A) involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid. B) involves mating factors attaching to target cells and causing production of new paracrine cells.
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C) requires nerve cells to release a neurotransmitter into synapse. D) has been found in plants but not animals. E) occurs only in paracrine yeast cells. 7) Which of the following is true of synaptic signaling and hormone signaling? A) Both use neurotransmitters, but hormone signaling is for adjacent cells in animals only. B) Hormone signaling is important between cells that are at greater distances apart than in synaptic signaling. C) Both are forms of paracrine signaling.
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This note was uploaded on 12/01/2010 for the course BIOS 140 taught by Professor Webster during the Spring '08 term at DeVry Austin.

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New Microsoft Word Document (2) - 1 In yeast(Saccharomyces...

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