Cellular BiologyA cell is the collection of living matter enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life. Cells are considered the basic unit of life because all living organisms are composed of one (unicellular) or more (multicellular) cells.
Cells are important in biology class because cell is the smallest living organism. How Big is it?In the biological world objects have different size, some of them are bigger others are smaller. The metric system is the method to measure objects. Its the easier method to measure objects, It is also the measurement system used in everyday life in most countries.
The metric system is needed by scientists so they can communicate. |
Types Of Cells Prokarotic cells are simple cells while Eukaryotic cells are complex
Both cells have ribosomes. Prokaryotic cells are unicellular, eukaryotic are multicellular. Prokaryotic cells are only found in bacteria, eukaryotic cells are found in plants and animals. Despite both cells are different, they have a metabolism and a similar base. |
Levels of Organization
Biological Systems are organized in different levels, from the lowest level to the highest. It contains 11 levels: atom, molecules, cell, tissue, organ, organ system,multicelled organism, population, community, ecosystem, biosphere,
Prokaryotic
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Similarities
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Eukaryotic
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Vizualizing cells
We are using a compound microscope to visualize cells.
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(Taken from Textbook p. 29 Questions about Microscopes and Cells) |
Bacterial cells (Prokaryotes)
Bacterial Cells at x40, drawing below.
Bacterial Cells at x100, drawing below.
Bacterial Cells at x400, drawing below.