Color? Everyone relates the bright‚ scenic colors of the trees with fall. What most people don’t know is why. For this process‚ also known as photosynthesis to happen it involves three different pigments that give the leaves their color. Trees are autotrophs; this means that they make their own food. The leaves obtain water through their roots‚ but also they need sunlight‚ carbon dioxide‚ and chlorophyll. Chlorophyll is the pigment that gives leaves their green color and makes photosynthesis happen
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Overloading in Fresh Waters 1. Nutrients and Nutrient Overloading 2. OM and BOD Overloading river N and P cycles‚ revisited. The concentrations of N‚ P C and O in the hydrosphere are intricately related by the Redfield relationship. N (+)/P (+) = 16 CO2 (+)/N (+) = 6.6O2(+)/N(-) = 8.6 CO2 (+)/P (+) =106 O2(+)/P(-) = 138 O2 (+)/CO2 (-) = 1.3 Atmosphere exchanges. Nitrogen:¡°fixed¡± N occurs in a number of gaseous forms that are easily exchanged to the atmosphere. Natural sources of atmospheric"fixed"
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much larger when compared to a prokaryotic cell. Unlike human cells‚ fungi are made of hyphae‚ which are fibrous branching filaments. Fungi also have a cell wall; however‚ their cell walls are composed of chitin‚ instead peptidoglycan. Fungi are heterotrophs‚ which means they consume nutrients from their environment. Similar to bacteria‚ fungi can have both beneficial and harmful effects. Fungi may cause diseases such as ringworm‚ athlete’s foot‚ or valley fever‚ but they can also have a positive effect
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QUESTIONS AND ANSWERS SECTION A: SIMILARITIES‚ DIFFERENCES‚ AND DEFINITIONS Gametes are mature haploid reproductive cells that unite to form a zygote that develops into a new individual. Gametes are also called sex cells. An egg or ovum is a haploid female reproductive cell or gamete whereas a sperm is a male haploid reproductive cell. A zygote is the initial cell that is formed as a result of the union of a male and a female gamete by means of sexual reproduction. The two haploid cells merge
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1/15/2013 Learning Outcomes After studying this chapter‚ you should be able to answer the following questions: Chapter 2 Lecture Outline Insert 7th ed Cover Art here •What are systems‚ and how do feedback loops affect them? •Explain the first and second laws of thermodynamics. •Ecologists say there is no “away” to throw things to‚ and that everything in the universe tends to slow down and fall apart. What do they mean? •Explain the processes of photosynthesis and respiration. •What qualities
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The freshwater biome | A lake at Acadia National Park‚ Maine. | Freshwater is defined as having a low salt concentration — usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e.‚ ocean). There are different types of freshwater regions: * Ponds and lakes * Streams and rivers * WetlandsPonds and lakes These regions range in size from just a few square meters to thousands
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Bio Review: Unit 1 Diversity of Living Things Diversity- all the different kinds of life on Earth Species Diversity- variety of species‚ abundance of the species in a given area Genetic Diversity- variation of genes within a species Ecosystem Diversity- diverse range of habitats‚ various organisms within habitats & relationships between them Prokaryotes Eukaryote Appearance Size - Always smaller - 1000x larger DNA structure - Plasmid (one strand circular DNA) - Dna in nucleoid
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Week #1 -autotrophs are organisms that harvest light or chemical energy in organic compounds. They self nutrition -heterotrophs are organisms that get complex nutrients from the environment (by eating other organisms) -Fungi are heterotrophs or predators because they are parasitic. Bread mold secretes digestive enzymes to enter the membrane. Same as foot fungus‚ it extends hyphae (fungal branches) into the cells to absorbs nutrients -One fungus makes traps for nematode worms while another fungus
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Chapter 2: Patterns in Nature 1. Cell theory • 1590: Dutch grind glass lens (1st compound microscope) • 1665: Robert Hooke uses compound m. analysis thin cork slices as filled with air enclosed in boxes (cells) distinct • 1676: Dutch sees microorganism under microscope from pond water • 1824: French suggest all organisms composed of cells • 1827: Robert Brown (Brownian motion) discovered nucleus in plant cell • 1838: German produced evidence that all organisms made of cells • 1859:
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organic molecules synthesized by other organisms‚ in soluble form or particulate form) Particulate food (visible particles) is acquired by phagocytosis (infolding or invagination of the cell membrane to surround a visible food particle); these heterotrophs are phagotrophs or holozoic feeders Those who ingest soluble food are osmotrophs or saprozoic feeders Autotrophic protozoa = phototroph; use light energy to synthesize their organic molecules‚ but often practice phagotrophy and
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