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chapter11-1
| Question | Answer |
|---|---|
| 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. |
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