2- Which of the following statements refers directly to the cell theor.pdf

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2. Which of the following statements refers directly to the cell theory? a. Animal cells are similar to plant cells. b. Only some cells have cell walls. c. Some cells have cell membranes. d. Eukaryote cells are more advanced than prokaryote cells. e. Protozoans consist of only one cell..

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2. What tastors are attritsuted as helping the woid population gren expenentially? 3. Scientists cannot agree when we will reach a carrying capacity, in other words, how many people the Earth can support. However, what do they all agree on? Why is it important for us to use our resources sustainably? Activity-Age Structure Graphs 4. What type of information can we obtain from age structure graphs (population pyramids)? 5. Compare and contrast the popelatiosi pyramids for your selected locations. Are the locations experiencing a population inctease, population decline, of stable growth? Fxplain. 1. Complete Table 6 1 identifying each feature as ehher a density dependent af denoliy. independent limiting factor. 2. What factors are attributed as helping the word population grow exponentially? 3. Schentids cancer asiee when we wilt roah a caroging najmiog in other work. how many prople the farth eail sipyrut. thowewe what the they all agiee eat why is it inphotant ker us ho uee our inouncs nistainahty? Activity-Age Structure Graphs 4. What bere or information can we oblain fiom ase structure graphs (poysulation Pramkin)? S. Compare and contrast the pypulation pramiks for your selected koations. tie the bxatisns eyceicexing a pryalation incmaxe. population derline or stable growth? Eylain. Explain. 6. What are some of the ecomomil and social challenges each cexunty mill fae in tie next 50 years based on the current gemin twend?.

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2. You want to use PCA to better understand a dataset that consists of data about different types of trees. (see picture below) Each tree has data on: tree height, trunk width, leaf width, leaf length, width of tree crown, crown height, bole height, points per leaf, some of which are shown in Figure 7 below. Give a brief explanation of how you might use PCA to uncover information about this data set. Figure 7: Some of the measurements taken for each tree..

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2. Some Polysaccharides: Tests for the Presence of Cellulose and Lignin Procedure You will conduct tests for different polysaccharides that may be found in different paper products that come from plants. a. To each of four depressions in a ceramic spot plate, place each of the following samples: a few fibers of cotton into depression 1. a very small piece of lens paper into depression 2. a very small piece of paper toweling into depression 3. - a very small piece of bond paper into depression 4. b. Add enough Lugol's solution (which contains iodine and potassium iodide) to cover each sample. c. Move each sample to a clean depression using a forceps. Using a pipette, gently rinse each sample with a few drops of water. d. Use a forceps to remove each of the above samples from the water onto a separate clean microscope slide and tease the fibers apart on the slide using sharp probes (teasing needles). Then add a coverslip and observe each sample under the microscope. e. While each slide is on the microscope stage, place one drop of 65% sulfuric acid ( H 2 SO 4 ) solution to the edge of each coverslip and allow it to diffuse under the coverslip by holding a small piece of paper toweling to the opposite edge of its coverslip. Caution! H 2 SO 4 is a strong acid and can cause burns. f. Observe and note any change in color that the sulfuric acid may have caused. g. A blue color indicates the presence of cellulose and an orange to yellow color indicates the presence of lignin, a different polysaccharide. Results Record your observations of the appearance of the fibers in Table 2. Table 2 Polysaccharide test results.

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