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change 2 - Online Activites Chapter 1 The Levels of Life...

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Online Activites: Chapter 1: The Levels of Life Card Game The Order of Part 1 & 2: Ecosystem, Community, Population, Organism, Organ System, Organ, Tissues, Cell, Molecule, and the Atom Energy Flow and Chemical Cycling The food we eat provides chemical energy for our bodies. This energy is in the form of organic molecules, particularly carbohydrates. Originally these organic molecules were produced by plants in the chemical reaction of photosynthesis. They get the energy from light. All organic molecules contain carbon. Like all animals, we get carbon atoms from organic molecules in the food we eat, and that carbon comes from plants. Plants take in carbon dioxide gas from the air and in photosynthesis they use the carbon atoms to build carbohydrates. So the carbon we eat originally came from the air. To use the energy in food, cells carry out cellular respiration, which converts organic molecules back into carbon dioxide gas. The carbon dioxide is used again by plants to make more organic molecules. Heritable Information: DNA DNA is a double helix that has two strands of nucleotides that are twisted together. There are two phosphate strands that are connected by the pair of bases that are hydrogen-bonded. Guanine is paired with cytosine and Adenine is paired with thymine. Comparing Prokaryotic and Eukaryotic Cells a) Blue colored eukaryotic cell. b) Orange eukaryotic cell. c) Orange, column-shaped, prokaryotic cell. d) Archaea cells are prokaryotic. e) The prokaryotic cell does not have a nucleus, bacteria f) The animal cell does not have a cell wall, blue tinted eukaryotic cell g) The prokaryotic cell doesn’t have organelles, bacteria Regulation: Negative and Positive Feedback Negative feedback occurs where a change in a physiological variable that is being monitored triggers a response that counteracts the initial fluctuation. Negative feedback regulates the chemical reactions in a cell. The negative feedback reduces the end result. Positive feedback increases the end result. Classification Schemes When the scientists first organized the organisms, it was only plants or animals. Years later there was a five kingdom classification that was established. There was one kingdom with prokaryotic cells which was monera. The other four kingdoms were prokaryotic. They were called fungi, protista, animals, and plants. After that the system was changed to have a more general domain. The domains for prokaryotes are Bacteria and Archaea. Form Fits Function: Cells Type of Cell Structure Function Nerve Cell Nerve cells have long extensions Nerve cells transmit signals.
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Muscle Cell Muscle cells have proteins that slide back and forth. Muscle cells contract Skin Cell Skin cells are closely joined. Skin cells protect.
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