QUESTION II-19992. Communication occurs among the cells in a multicellular organism. Choose THREE of the following examples of cell-to-cell communication, and for each example, describe the communication that occurs and the types of responses that result from this communication.1999 SCORING GUIDELINES Plasmodesmata (elab. pt. for good description) Signal (1 Pt. max.) A specific plant hormone Responses/Elab. (2 pts. max.) Various physiological changes Ion movement; H20 movement; RNA movement Communication between two immune system cells (4 pts. max) Source (1 Pt. max.) Any two immune system cells interacting or An immune system cell interacting with the product of another immune system cell Signal (1 p1. max.) Tc/APC docking Antibody Histamine Interferon Responses/Elab. (2 pts. max.) Discharge of perform; phagocytosis of pathogen; inflammatory response; phagocyte activation; Ab secretion; clonal selection Communication between two neurons OR between a neuron and a muscle cell (4 pts. max) Source (I pt. max.) Sending neuron Signal (1 pt. max.) Neurotransmitter Responses/Elab. (2 pts. max.) Neuron-neuron: Chemical gating; depolarization of postsynaptic membrane; EPSP, IPSP, or both Neuron-muscle: Action potential to T tubules; Ca ++ release from sarcoplasmic reticulum; Ca ++ binding to troponin; cross-bridge formation Communication between a specific endocrine-gland cell and its target cell (4 pts. max) Source (I pt. max.) Specific gland (elaboration point for peptide vs. steroid hormone pathways) Signal (1 Pt. max.) Specific hormone Responses/Elab. (2 pts. max.) Specific effect Copyright 2001 by College Entrance Examination Board. All rights reserved. |