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Lecture 15

MICB 201 Lecture 15: Nutrition

6 Pages

Course Code
MICB 201
Wade Bingle

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Chapter 7: Nutrition 7.1 Roles of nutrients Nutrients are substances taken from the environment and used as Sources of major bioelements Sources of minor bioelements Sources of electrons Sources of energy or components of reactions that yield energy e.g. energy sources and terminal electron accepters (TEAs) 7.2 Types of nutrients 1) Light 2) Chemical Organic (CHX) Possess C and have at least one C-H, N-H or S-H bond Many different types of organic chemicals most are composed of several major bioelements Inorganic Lack C or if have C, lack C-H, N-H or S-H bonds Many different types of inorganic chemicals 7.3 Nutritional diversity: trophs Nutritional diversity: different organisms use different nutrients to satisfy their nutritional requirements Energy Source Light Phototroph Chemical Chemotroph Electron Source Organic chemical Organotroph Inorganic chemical Lithotroph Carbon (C) Source Organic chemical Heterotroph Inorganic chemical Autotroph e.g. CO2Terminology is really for organisms. Examples: Humans: chemoorganoheterotroph Plants complicated: - Organism: photolithoautotroph - Energy: light Electrons: H 2 Carbon: CO 2 - Green tissue is photolithoautotrophic - Non-green tissue is chemoorganoheterotrophic A note on autotrophic prokaryotes and other autotrophs Autotroph means self-feeder Often, autotrophs are said to make their own food so they do not rely on molecules produced by other organisms This is NOT TRUE CO 2 H2O, O 2 minerals and light are plant food Plants and other autotrophs do rely on molecules produced by other organisms e.g. consume CO p2oduced by heterotrophs Concept applies to plant-like prokaryotes 7.4 Nutrie
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