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Transcript
In the beginning, there were Cells… • Bacteria are thought to be the earliest forms of life on the planet. • Simple life flourished in tidal pools near the sea. • Water was warm and full of nutrients. Bacteria evolved into different cell types • Some bacteria evolved into protists. • There are three types of protists which later evolved into more complex organisms. – Protozoa animal-like – Algae plant-like – Slime molds fungi-like Protozoa consume other organisms for energy like animals do Algae make sugar through photosynthesis like plants do Slime molds reproduce using spores like fungi do ANIMAL EUKARYOTIC PLANT PROKARYOTIC BACTERIA, ARCHAEA Energy Structures in cells Mitochondria Chloroplasts • Membrane-bound organelle found in all eukaryotic cells • Chloroplasts are the food producers of the cell. • “Powerhouse” of the cell • They are only found in plant cells and some protists. • Converts sugars into useable energy for the cell CELLULAR RESPIRATION PHOTOSYNTHESIS CELL WALL • Found in plants, algae, fungi, and most prokaryotes • Porous to micromolecules and dissolved materials - water - oxygen - carbon dioxide • Achaea: cell wall = proteins • Bacteria: cell wall = proteins and polysaccharides • Plants: cell wall = polysaccharides