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Organizing Life

Now that we’ve spent some time getting to know our key vocabulary in the biology sequence, let’s start to delve a little deeper into the links and relationships among those words.

The Cell Theory is one of the foundational ideas behind all of biology, and it is something you must be familiar with before starting any future classes in bio. There are 3 main postulates to the Cell Theory, which I’ve listed below.

  1. All living things are made of cells.
  2. All cells come from pre-existing cells.
  3. The cell is the smallest unit of life.

Even though all living things are made of cells, not all cells are alike. Living organisms are classified into 5 kingdoms of life based on differences in their physiology and cell function. I think the link above and the image below nicely summarizes the way we classify living organisms.

In this unit we’ll look at one of the key distinctions among Earth organisms: the differences between plant and animal cells. The notes packet and diagrams you received in class contain the “official class notes” on this topic, so don’t lose them! You might also find the following items somewhat useful:

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