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Scientific Drawings
Important standards:
 Use pencil – colored pencils are okay
 Use a ruler to draw your label lines out to a common margin
 Include a title; magnification; and a descriptive caption
Label the following structures whenever present: cell wall, cell membrane, cytoplasm, vacuole, nucleus, nucleolus, chloroplast.
A.
B.
Scientific Drawings
Important standards:
 Use pencil – colored pencils are okay
 Use a ruler to draw your label lines out to a common margin
 Include a title; magnification; and a descriptive caption
Label the following structures whenever present: cell wall, cell membrane, cytoplasm, vacuole, nucleus, nucleolus, chloroplast.
C.
D.
Analysis
A. Onion cells
1. Describe the shape of the onion cells.
2. Are all the cells similar in shape?
3. What color is the living cytoplasm?
4. When you add a drop of iodine, what effect does the stain have on the cells?
5. What is the appearance of the cytoplasm when you view the onion under high power?
6. What is the appearance of the nucleus?
7. Are the nuclei always in the same position in the cell?
8. Does the onion epidermal cell have depth? Explain.
B. Elodea Cells
1. In which layer are the widest cells located?
2. What is the appearance of the cytoplasm?
3. Describe the appearance of the cell membrane and the cell wall.
4. Are any of the chloroplasts moving?
chloroplasts?
If so, describe the movement of the
5. Why do the chloroplasts move?
C. Human Cheek Cells
1. Describe the shape of the cheek cells.
2. Are all the cells similar in shape?
4. What is the effect of the methylene blue stain on the cells?
5. What is the appearance of the cytoplasm when you view a cheek cell under high power?
6. What is the appearance of the nucleus?
7. Are the nuclei always in the same position in the cell?
D. Human Histology Slide
1. Which slide did you choose to view?
2. Describe the shape of the cells that you viewed.
3. Are all the cells on the slide similar in shape?
4. What is the effect of the stain on the cells?
5. Can you see the nucleus? If so, describe the appearance and position of the nucleus.
Summary
1. How are all eukaryotic cells similar?
2. In what ways do cells differ from one another?
3. Use the cells that you looked at in lab as examples to explain how the structure of a cell
matches it’s function.
4. If chloroplasts are typical of plant cells, explain why they are not present in onion cells.
5. Your textbook describes many kinds of cell organelles. Why do you think these
numerous organelles are not visible in the slides you viewed during this lab?
4. As a result of completing this lab, what did you discover about cells that you didn’t know
before?