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HBIO Stations Activity DNA/Chromosomes Directions: Answer the following questions concerning each station at the lab tables. Station 1: (A) Sketch one of these cells. Did you draw a nucleus? How does the size of this cell compare to human cells? Label your drawing prokaryotic – bacteria. (B) Sketch the cell; be sure to draw the nucleus. Do you see other structures in the cell? Draw the structures in the cell. Station 2: (A) These cells are from a root tip that is growing and dividing. Sketch the cell the pointer is on. Label the nucleus. How do you know this is a plant cell? (B) Sketch the cell the pointer is on. Pay particular attention to the dark lines in the middle of the cell. Is this a eukaryotic or prokaryotic cell? Is this cell dividing or not? What are the dark lines? Why aren’t the dark lines in every cell? Station 3: Look at the pictures in these two books. Now describe how a chromosome forms. Station 4: Page 130 in the green book shows cells that are not dividing. Page 168-169 in the blue book has photos of cells that are dividing. Describe the differences in the nucleus of a dividing and nondividing cell. Station 5: These are pictures of human karyotypes. How many chromosomes do humans have? Do males and females have the same number of chromosomes? Are all the chromosomes alike? Explain. Station 6: This picture shows DNA replicating. What does replication mean? How does the new DNA ladder know which order to put the bases in?