ChemicalContextofLife

ChemicalContextofLife - BSC 2010 Biological Science I...

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BSC 2010 Biological Science I Spring 2011 Lecture Topic 1: Introduction and The Chemical Context of Life
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Introduction to the Course BSC 2010 Biological Science 1, section 03 Dr. Lloyd M. Epstein, First Day Attendance Report Web site accessible through blackboard Syllabus and Schedule on General Information page of web site
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1. What is your current career objective? A. Physician B. Nurse C. Other health care professional D. Research or Teaching E. Other or undecided
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2. Of the following, what do you value the most in your physician? A. That he or she graduated in the top 10% of their class at medical school. B. His or her ability to remember your vital information and discuss them without referencing your charts during your doctor-patient conference. C. His or her understanding of how your body works and how it reacts to stress, strain, diet, and medicine. D. His or her caring, warm, and/or friendly personality. E. Other (be prepared to state what it is)
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The hierarchy of biological organization. Fig. 1.6, Biology, Solomon, Berg, and Martin, 7 th ed. Unit I. Atoms and biological molecules Unit II. Cell biology and biochemistry Unit IV. Physiology Unit III. Molecular biology
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Matter, Elements and Compounds Organisms are composed of  matter that obey physical and  chemical laws.  Matter is anything that takes up space and has  mass. Matter is made up of building blocks called elements.  An  element  is a substance that cannot be broken down to other  substances by chemical reactions. compound  is a substance that consists of two or more  elements in a fixed ratio. The characteristics of a compound can be  very different from those of its component elements.
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Fig. 2-3 Elements can combine to form compounds. Sodium Chlorine Sodium chloride Highly reactive soft metal Pale green gas, used as a disinfectant Table salt
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Table 2-1 About 25 of the 92 elements are essential to life Carbon, hydrogen, oxygen, and nitrogen make up 96% of living matter Most of the remaining 4% consists of calcium, phosphorus, potassium, and sulfur Trace elements are those required by an organism in minute quantities
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An element’s properties depend on the structure of its atoms Each element consists of unique atoms An atom is the smallest unit of matter that still retains the properties of an element Atoms are composed of subatomic particles: Neutrons (no electrical charge) Protons (positive charge) Electrons (negative charge)
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(b) Cloud of negative charge (2 electrons) Nucleus Electrons Neutrons and protons form the atomic nucleus Electrons form a cloud around the nucleus Neutron mass and proton mass are almost identical. Atomic masses are expressed in terms of daltons.
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ChemicalContextofLife - BSC 2010 Biological Science I...

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