cell is basic unit of life



miosis

cell study

Human cheek cell (400x) The cells of human cheek cells do not have cell walls, but they do posses cell membranes that provide support to the cells. The cells viewed all appeared to have the same shape and are all the same. The cells contain a nucleus, but do not conatin vacuoles or chloroplasts. Spelling KC Elodea (400x) The chloroplasts of the elodea sample that i obtained, did not have any moving chloroplasts. If the chloroplasts would have been moving, it would have showed the direction of their movement in the cells.. In each cell the chloroplasts are moving in the same direction, however the direction of movement can differ between different cells. Chloroplasts have no structure that allows them to move, light and heat enables their movement rate. Rachel= movement in each cell is the same but may be different between cells. Onion skin (400x) (left without iodine, right contains iodine) Onions did not react the same way as the potatoes did when exposed to iodine. Iodine detects starch, and instead of turning black like in the potatoes, it remained the orange brownish color that it originally was. Onions do not contain starch. The iodine did help reveal the presence of the other organelles in the onion though. My hypothesis about the potato was correct, neither the onion or the potato have any chloroplasts due to where they are grown. Since they both grow underground, the light and heat needed to function is not present, making it impossible to work. Potato (400x) The cells present in a potato are very large. A potato cell is maily made up of leucoplasts, which are the all of the black blobs present in the picture.These leucoplasts are black because the iodine found starch in the cell and turned them black. This picture also shows a cell wall, all the leucoplasts, and the cytoplasm which is in between the leucoplasts. The cell contained no chloroplasts, because chloroplast requires heat and light to function, and underground (where potatoes grow) there is neither. In the bottle, iodine is an orange brownish color, but when it comes in contact with the leucoplasts, it turns black, because starch is only present in the leucoplasts. So there is starch present in potatoes. Beet pulp (400x) The cell wall is thicker than tomato pulp cell wall but thinner than the cell wall found in the tomato skin. The purple chromoplasts seem to be spread out throught the cytoplasm rather than in the plastids. They are not the same tint of color, because they are different colors. The tomato skin pigment was more red and highly concentrated than the beet's purple pigment. Tomato Pulp (400x) The tomato pulp cells have no real color, except for some slight blotches of red. These cells are also irregularly shaped. In ths cell, the cell wall is extremely thin, compared to the tomato skin cell wall which seems to be a lot thicker. I believe the cell walls in the pulp are thinner of those in the skin because the pulp contains a lot more liquid than the skin. The chromoplasts in the tomato pulp are more spread out and have a larger region to spread out, as opposed to the skin which is a vivid red color, because it is more concentrated. Tomato Skin (400x) The tomato skin was one cell thick. These cells in this specimen vary in size and shape. They appear to have a slightly circular shape, but are very irregular.These cells have a slightly reddish pink tint to them because of the chromoplasts that are present. The tomato skin cells do not have chloroplast in them because there is no green color present, instead they contain chloroplasts. The structure of the cell wall is semi-thin, but it is strong enough to hold the pulp in withough breaking. Conclusion 1. Both plant and animal cells are very similar. The are both eukaryotic cells, and both seem to have a nucleus and they both have a cell membrane. Both cells also contain a mitochondria, nucleus, cytoplasm, and endoplasmic reticulum. Both cells also contain a vacuole, it's just a lot bigger in a plant cell than in an animal cell. 2. Plant and animal cells are also different. Plant cells contain cell walls and chloroplasts which are used for photosynthesis. Animal cells do not need these. Instead, animal cells contain centrioles, which plants cell do not have. 3. The cells are similar in size and shape usually. The organelles that are inside the cells are identical, and are located in the same place in each cell. The color of the cells are also going to be the same if they're from a similar part of the organism. 4. The purpose of staining cells is to make the organelles within the cells present. In this lab, it made starch in different specimens present. help on how to format text