Lab Notes: Cell Structure

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Register to read the introduction… Sites of protein synthesis
Golgi apparatus n. Packages materials in vesicles for export from the cell
Centrioles o. Forms microtubule system in animal cells

Onion Epidermal Cells a. What is the clear area in the center of the cell?
Nucleus
b. Describe the location of the cytoplasm with respect to (a).
Center
c. Describe the shape of the nucleus.
Circular
d. List the cellular structures that you are able to see.
Cell wall, Cytoplasm, Large Circular Nucleus e. Some nuclei do not appear to be located against a cell wall. How do you explain this?
Some nuclei are too small and onion epidermal cells occur mitosis (nuclear division) and cytokinesis(cell division). Interphase cell typically have one or more number of nuclei, so a few nuclei do not appear next to a cell wall. f. Determine the average length and width of the three cells (in mm)
Cell wall: 0.8 mm, Cytoplasm: 0.6 mm and Nucleus: 0.4 mm

Hydrilla Leaf Cells a. Are the cells of each layer approximately the same size?
Yes
b. Describe the shape of a cell?
Square
c. What gives the cell its shape?
Cell wall d. What organelles contain chlorophyll?
Chloroplast
e. What structure fills the greatest volume in the
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b. Are epithelial cells thinner or thicker than Hydrilla cells?
Epithelial cells are thicker than Hydrilla cells
c. Determine the average width and length of three cells (in mm)
Chloroplast: 0.5 mm, cell wall: 1mm and vacuole: 0.8mm
Liver Cells
Liver cells and visible structures
Amoeba
a. Does the organism exhibit all characteristics of living organism?
Yes, well, the basic characteristics of all living things are: contains DNA (genetic material), metabolism and reproduction. Amoeba does all. b. Is the cell membrane of the organism rigid or flexible?
Flexible
Tissues
Tissues observed in the earthworm
Define:
a. Unicellular Organism Any living being consisting of a single cell. Most are invisible without a microscope but a few, such as the giant amoeba, may be visible to the naked eye. The main groups of unicellular organisms are bacteria, archaea, protozoa, unicellular algae, and unicellular fungi or yeasts. Some become disease-causing agents (pathogens). b. Colonial Organism A collection of genetically identical cells that are permanently associated but in which little or no integration of cell activities occurs. c. Multicellular

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