B2

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  • B2
    • Cells, tissues and Organs
      • PLANT CELLS
        • CELL WALL : made of cellulose which acts to strengthen and support the cell
        • CHLOROPLASTS: contains chloropyll which adsorbs light energy for photosynthesis
        • CELL MEMBRANE: controls everything that enters and leaves the cell
        • MITOCHONDRIA: where oxygen is used and energy is produced
        • RIBOSOMES: makes all protein needed in the cell
        • CYTOPLASM: where most chemical reactions take place
      • Animal Cells
        • CELL MEMBRANE: controls the passage of substances in the cell
        • CYTOPLASM: where most chemical reactions take place
        • MITOCHONDRIA: where most energy is released in respiration
        • NUCLEUS: controls all activity in the cell
        • RIBOSOMES: where protein is produced "Protein synthesis"
      • Oxygen and other dissolved substances move in and out cells by diffusion
    • Cell division, inheritance, speciation
      • MEIOSIS: cells divide to produce gametes and genetically different cells
        • Each has half the normal amount of chromosomes
      • ALLELES: a gene controlling certain characteristics
      • MITIOSIS: cell division resulting in 2 identical daughter cells
      • if 2 populations of a species separated a new species can arise
        • Natural selection can make them different so they cannot interbreed
    • Plants and enviroment
      • Chlorophyll in plants adsorbs energy from the sun
        • PHOTOSYNTHESIS
          • Limiting factors: Light, CO2, temperature and concertration
          • CO2 + H20 -------> GLUCOSE + O
      • Glucose is needed to supply energy
        • Starch and Fat
        • Make protein for producing enzymes
      • Distribution of different species is dependant on :Oxygen, Temperature, Nutrients, Light and Water
    • Protein and respiration
      • AEROBIC
        • Produced with a mix of glucose and oxygen
      • ANAROBIC
        • Small amounts of energy are released from glucose without oxygen
      • protein molecules are long chains of amino acids
      • Living organisms release energy from glucose by respiration
      • Enzymes are biological catalysts
      • Enzymes productivity can be effected by PH and temperature
      • Hormones, antibodies and enzymes are examples of protiens

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