web_L32_10BIO311C - BIO 311C Spring 2010 Your graded Exam 3...

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BIO 311C Spring 2010 Lecture 32 – Monday 19 Apr. 1 Your graded Exam 3 will be available for you to pick up at the end of Wednesday’s lecture. The key to Exam 3 will be posted on the course web site on Wednesday (April 21). If you believe that a question on your Exam 3 was graded incorrectly or your score was calculated inaccurately, then see Rebecca before 4:00 p.m. on Monday (April 26) to explain your concern. We cannot consider changes after that time.
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Cell Communication 2 The lecture/PowerPoint presentation on Cell Communication is abbreviated, so Final Exam questions on that topic may rely more heavily on information contained in the textbook reading assignment than is the case for other topics covered in this course. *
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Cells sense and respond to their environment in various ways. Example 1: food, energy wastes metabolism Living Cell The cell senses sources of food/energy in the environment and responds by utilizing specialized mechanisms to incorporate and metabolize these substances, then selectively discard wastes. Example 2: biological, physical or chemical assault on the cell altered metabolism Living Cell The cell senses an agent of potential damage in the environment and responds by (1) generating a counteractive assault, (2) by protecting itself in some way from the danger, and/or (3) by dying, often by a carefully regulated mechanism called apoptosis. (fight back, adjust, or die) * 3
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Single-celled (unicellular) organisms often communicate via chemical signals. Example : a unicellular eukaryote species containing males and females sexual signal Responds in a way that facilitates sexual reproduction Organism of Opposite Sex A unicellular organism senses a signal from an organism of the opposite sex, then responds by preparing to contact the signaling organism in order to transfer or combine combine genetic information. Organism of One Sex * Also see Textbook Fig. 11.2, p. 207. Produces a chemical substance intended to alert another cell signaling cell responding cell 4
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The Cells within a complex multicellular organism communicate extensively via chemical signals. hormone (a kind of signaling molecule) Response that may profoundly change characteristics of the cell Responding Cell (responds to the hormone) A hormone may be defined as: a chemical substance that is produced in one kind of cell of a multicellular organism, and that is sensed by another kind of cell within the organism where it elicits a response. (Also see textbook glossary for a different wording of the definition.)
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This note was uploaded on 06/11/2010 for the course BIO 48765 taught by Professor Sathasvian during the Spring '10 term at University of Texas at Austin.

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web_L32_10BIO311C - BIO 311C Spring 2010 Your graded Exam 3...

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