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1) In yeast (Saccharomyces cerevisiae), the two sexes are called B) a and alpha.
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.
3) Which of the following is true of the mating signal-transduction pathway in yeast? C) Mating type a secretes a signal called a factor.
4) Which of the following responses would be expected in myxobacteria when nutrients are scarce? C) Starving cells secrete a chemical signal that simulates other cells to aggregate in the soil and form spores.
5) What could happen to target cells in an animal that lack receptors for local regulators? B) They would not be expected to multiply in response to growth factors from nearby cells.
6) Paracrine signaling A) involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid.
7) Which of the following is true of synaptic signaling and hormone signaling? B) Hormone signaling is important between cells that are at greater distances apart than in synaptic signaling.
8) The old saying "one rotten apple spoils the whole barrel" comes from chemical signaling in plants D) via release of ethylene gas, a plant hormone for ripening.
9) From the perspective of the cell receiving the message, the three stages of cell signaling are C) signal reception, signal transduction, and cellular response.
10) A small molecule that specifically binds to a larger one C) is a ligand
11) Ligand-gated ion channels A) open or close in response to a chemical signal. B) are important in the nervous system. C) lead to changes in sodium and calcium concentrations in cells. D) involve A and B. E) involve A, B, and C. correct
12) Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to E) a specific catalytic site of an enzyme binding to a substrate.
13) Most signal molecules D) A and B. A) are water soluble. B) bind to specific sites on receptor proteins in a membrane. C) are able to pass through the plasma membrane by active transport. D) A and B. E) A, B, and C.
14) Which of the following signal systems use(s) G-protein-linked receptors? A) neurotransmitters B) yeast mating factors C) epinephrine D) A and C E) A, B, and C E) A, B, and C
15) The signaling system in an animal cell lacking the ability to produce GTP A) could activate only the epinephrine system. B) would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. C) was discove B) would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.
Created by: Kim Cherry Kim Cherry on 2010-07-15

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