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+ Journal #3 – Do Now Sit in seats from Monday and pull out your science notebook. Complete Journal #3 on your next blank page. Answer the question in a complete sentence and write out the hypothesis stem, completing the sentence. What do you think happened to the gummy bear after sitting in water overnight? Finish the hypothesis: If a gummy bear is submersed in water overnight, then the gummy bear will… + Osmosis Lab (Day 2) With your partner, find your cup and carefully pour out the remaining water in the cup into the sink Place your cup, with the bear inside, on the scale and record the weight. Place the empty cup sitting next to the scale on the scale and record the weight of the empty cup. Calculate the weight of the bear: (Weight of Bear in cup) – (Weight of empty cup) = Weight of bear Draw a picture of the bear in the second dotted box on the handout sheet. Draw arrows to indicate where you think the water went. Once your observations have been made, take your cup back to the lab table and set your cup in your designated class period space. You will finish the lab on Friday and learn about how water moves through cells. + Cell Differentiation Previous Class… Intro to Cells and Osmosis Lab (Day 1) + Cell Differentiation Look into the micro-viewer Write down 3 words that describe what you see on the same page you wrote Journal #3 Shape Size Color + All cells of an organism contain the same DNA Embryonic Stem Cells DNA Nerve Cells Voluntary Muscle Cells Red Blood Cells + If our cells contain the same DNA, why do we look like humans and not a 100 trillion cell blob? + …because our cells are differentiated. + During Differentiation, a cell becomes specialized. When a cell is specialized only certain fragments of DNA are expressed. + All differentiated cells develop from stem cells, unspecialized cells found in both the early stages of development and in the adult body. + “Do I have to declare a major? Couldn’t I just be a stem cell?” + The human embryo forms into a blastocyst after four days of development. Cells that can develop into any cell type are called pluripotent. + Embryonic Stem Cells Adult Stem Cells Cells that can develop into any cell type are called pluripotent. Cells that are limited to replacing cells in the tissues where they are found are called multipotent. + A possible future treatment for heart disease? + Stem cells may make it possible to develop a new field of regenerative medicine. Undifferentiated cells are used to repair or replace damaged cells and tissues. + Cells of Your Body Complete the worksheet Read and follow the directions for each slide The text folder will help you fill in the information on the worksheet This worksheet will be collected at the end of class.