Download Chapter 5c

TORTORA • FUNKE
• CASE
Microbiology
AN INTRODUCTION
EIGHTH EDITION
Chapter 5, part C
Microbial Metabolism
Feeding methods
Feeding methods
Chemotrophs
• Use energy from chemicals.
– Chemoheterotroph
Glucose
NAD+
ETC
Pyruvic acid
NADH
• Energy is used in anabolism.
ADP + P
ATP
Chemotrophs
• Use energy from chemicals.
– Chemoautotroph, Thiobacillus ferroxidans
2Fe2+
NAD+
ETC
2Fe3+
NADH
ADP + P
ATP
2 H+
• Energy used in the Calvin-Benson cycle to fix CO2.
Phototrophs
• Use light energy.
Chlorophyll
ETC
Chlorophyll
oxidized
ADP + P
ATP
• Photoautotrophs use light energy in the CalvinBenson cycle to fix CO2.
• Photoheterotrophs use light energy and organic
compounds.
Metabolic Diversity Among
Organisms
Nutritional type
Energy source
Carbon source
Example
Photoautotroph
Light
CO2
Oxygenic: Cyanobacteria
plants.
Anoxygenic: Green, purple
bacteria.
Green, purple nonsulfur
bacteria.
Photoheterotroph
Light
Organic compounds
Chemoautotroph
Chemical
CO2
Iron-oxidizing bacteria.
Chemoheterotroph
Chemical
Organic compounds
Fermentative bacteria.
Animals, protozoa, fungi,
bacteria.
Metabolic Pathways of Energy
Use
• Polysaccharide Biosynthesis
Figure 5.28
Metabolic Pathways of Energy
Use
• Lipid
Biosynthesis
Figure 5.29
Metabolic Pathways of Energy
Use
• Amino Acid and Protein Biosynthesis
Figure 5.30a
Metabolic Pathways of Energy
Use
• Amino Acid and Protein Biosynthesis
Figure 5.30b
Metabolic Pathways of Energy
Use
• Purine and
Pyrimidine
Biosynthesi
s
Figure 5.31
Amphibolic pathways
• Are metabolic pathways that have both
catabolic and anabolic functions.
Figure 5.32.1
Amphibolic pathways
Figure 5.32.2