web.pdx.edu/~rueterj/bi445/notes/major_concepts.htm
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10 nm -1um
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um
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cm
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m
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sec
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min
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hr
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generation
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10 gen
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> 10 gen
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| biochemical composition |
ultrastructure and cell morphology |
metabolism |
growth |
reproduction |
community processes |
ecosystem constraints |
evolution and phylogenetics |
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physiology
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ecology
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Biochemistry
- biochemical unity of life
- four major classes of compounds
- proteins
- lipids
- polysaccharides
- nucleotides
- importance of membrance in separating phases of cell chemistry
- cell composition
Ultrastructure and cell morphology
- cell size and shape
- surface area to volume ratio
- photoautotrophs
- protists and cyanobacteria
- single cells and colonies
Metabolism
- photosynthesis
- light reaction
- Calvin Cycle, importance of RuBisCO
- nutrient uptake and assimilation follows enzyme type kinetics
- membrane transport
- diffusion
- facilitated diffusion
- primary active transport
- secondary active transport
- Pathways (heterotrophic and biosynthetic)
Growth
- growth is a function of current biomass
- exponential growth
- logistic growth model
- reinvestment during growth
Reproduction
- cell division cycle - individual cell level
- sexual reproduction
Community processes
- competition for resources
- efficiency of uptake
- minimum resource to maintain zero net growth (new growth = loss)
- succession due to competition
Ecosystem constraints
- aquatic environment
- light and nutrient availability profiles
- density
- mixing
- sources of nutrients
- importance of the bottom in lakes
- algal control over nutrient concentration
Evolution and phylogenetics
- modern synthesis
- gene -> protein -> physiology -> population -> competitive exclusion
-> selection for gene ->
Mar 27, 2000