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Lecture 15

MICB 201 Lecture Notes - Lecture 15: Electron Acceptor, Ribose, DeoxyribosePremium

6 pages101 viewsWinter 2017

Department
Microbiology
Course Code
MICB 201
Professor
Wade Bingle
Lecture
15

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Chapter 7: Nutrition
7.1 Roles of nutrients
Nutriets are sustaes take fro the eiroet ad 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 Nutritioal 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
e.g. CO2
Autotroph
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Terminology is really for organisms.
Examples:
Humans: chemoorganoheterotroph
Plants complicated:
- Organism: photolithoautotroph
- Energy: light
Electrons: H2O
Carbon: CO2
- Green tissue is photolithoautotrophic
- Non-green tissue is chemoorganoheterotrophic
A note on autotrophic prokaryotes and other autotrophs
Autotroph eas self-feeder
Ofte, autotrophs are said to ake their o food so the do ot rel o
molecules produced by other organisms
This is NOT TRUE
CO2, H2O, O2, minerals and light are plant food
Plants and other autotrophs do rely on molecules produced by other organisms
e.g. consume CO2 produced by heterotrophs
Concept applies to plant-like prokaryotes
7.4 Nutrients as sources of chemical elements
Major bioelements
C, N, P, S, O, H
Required to build organic cellular molecules. eg. protein, DNA, RNA, lipid,
polysaccharide etc.
Nutritional sources of major bioelements: varies with organism
Minor bioelements (aka minerals, trace elements)
Fe, Ca, Mg, Zn, Cu, others
Required for enzyme function: most form part of the structure of active sites
Electron carriers in ETC (e.g. Fe+3, Cu+2)
Membrane stabilization (e.g. Mg+2 and Ca+2)
Nutritional sources of minor bioelements same for all organisms: found in soil and
rocks so end-up i ater; the’re everywhere
Special case: Vitamins
Small organic molecules: composed of the major bioelements
Examples: Riboflavin, Thiamine, Niacin
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