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Bio week 2 notes

by: Brooke Martin

Bio week 2 notes Biol 2108k

Brooke Martin
GPA 3.9

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About this Document

ecology, carbon cycle, tropic levels
Principles of Biology II
Class Notes
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This 3 page Class Notes was uploaded by Brooke Martin on Friday September 9, 2016. The Class Notes belongs to Biol 2108k at Georgia State University taught by Brewer in Fall 2016. Since its upload, it has received 6 views. For similar materials see Principles of Biology II in Biology at Georgia State University.


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Date Created: 09/09/16
Biology 2 MW 12:00 PM Week 1 Notes August 28, 2016 CYCLING CARBON  CO₂ fluctuates over a year CARBON CYCLE  Reservoirs: where nutrients is stored o Organisms, atmosphere, soil, ocean, and sedimentary rock  Fluxes: rate at which Carbon flows from reservoirs  Short term: driven by biological activity , measured in decades  Long term: driven by physical process, measured in centuries or longer CO₂ = greenhouse gas  Traps heat CLIMATE CHANGE  Interglacial: temperature above average, ice sheet retreat  Glacial: temperature below average, ice sheet expand  Evidence: ice cores o Atmosphere in ice bubbles (gas sample) ICE ALBEDO  Positive feedback: Growing or melting ice  Max glacial: valleys in graph  Max interglacial: peaks in graph ECOLOGY  Study of interactions between groups or organisms and non-living environment  Hierarchy o Biosphere (all ecosystems) o Ecosystem (all living and non-living aspects in an area) o Community (all living aspects in an area) o Population (same species and geographic area) o Organisms TROPHIC LEVELS pTrophic levelTrophic level 2ry generates organicmc ernsumer: molecuo lebstvia coartaonn caarbon via photosy pnrimeasisppriodarye ronsumer Energy transfer between trophic levels not efficient PCycle: photosynthesis and respiration SoCO2 levels lower in summer months due to photosynthesis LoSteady incline due to human activity GEOLOGICAL PROCESSES THAT INFLUENCE LONG TERM CARBON CYCLING 2. Chemical weathering: remove CO2 from atmosphere Bioaccumulation: toxins over time gong up food chainhering Biomagnification: higher level of toxins going up food chain PROKARYOTE No membrane bound nucleus Plasmid: ring of DNA helpful for survival  No organelles  Cell wall o Gram + : thick wall of peptidoglycan o Gram - : thin wall of peptidoglycan  Archaea: extreme environmentalist HORIZONTAL GENE TRANSFER  Conjugation – pili connect to another bacteria; exchange of duplicated plasmids  Transformation – take up random DNA via environment  Transduction – DNA transferred by virus


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