attached image is an image of the cells you would have been looking at under the microscope Count at least 50 cells. When done, there should be at least 50 marks on the table (one mark for each cell). You may need to count more than 50 to find at least one of every phase. Calculate the proportions, and estimate the amount of time spent in each phase and subphase. The table will lead you through how this works. Take the number of cells in a particular phase, divided by the total number of cells examined (i.e., 50—or more), then multiply by 24 (the number of hours an average onion root tip cell takes to complete the entire cycle. This should give the hours a cell spends in each phase. Again, this assumes, that the entire cell cycle for onion root cells is 24 hours. This time can vary in different organisms. FILL-IN this table with the results of your count of 50 cells Phase/Subphase # of cells Calculation (fraction of cells x total hours of the cell cycle) # hours spent in this subphase (of 24 hr total cycle) Interphase # cells/50 X 24hrs Prophase # cells/50 X 24hrs Metaphase # cells/50 X 24hrs Anaphase # cells/50 X 24hrs Telophase # cells/50 X 24hrs Hours spent in Interphase? ____________________ Hours spent in Mitosis? ______________________ (Note: Mitosis = prophase + metaphase + anaphase + telophase)
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
attached image is an image of the cells you would have been looking at under the microscope
Count at least 50 cells. When done, there should be at least 50 marks on the table (one mark for each cell). You may need to count more than 50 to find at least one of every phase.
- Calculate the proportions, and estimate the amount of time spent in each phase and subphase. The table will lead you through how this works. Take the number of cells in a particular phase, divided by the total number of cells examined (i.e., 50—or more), then multiply by 24 (the number of hours an average onion root tip cell takes to complete the entire cycle. This should give the hours a cell spends in each phase. Again, this assumes, that the entire cell cycle for onion root cells is 24 hours. This time can vary in different organisms.
FILL-IN this table with the results of your count of 50 cells
|
Phase/Subphase |
# of cells |
Calculation (fraction of cells x total hours of the cell cycle) |
# hours spent in this subphase (of 24 hr total cycle) |
|
Interphase |
|
# cells/50 X 24hrs |
|
|
Prophase |
|
# cells/50 X 24hrs |
|
|
Metaphase |
|
# cells/50 X 24hrs |
|
|
Anaphase |
|
# cells/50 X 24hrs |
|
|
Telophase |
|
# cells/50 X 24hrs |
|
Hours spent in Interphase? ____________________
Hours spent in Mitosis? ______________________ (Note: Mitosis = prophase + metaphase + anaphase + telophase)
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