Unit Context

The Cell

All living organisms are made from cells. Cells are the building blocks of life. In fact, life starts from a single cell by means of reproduction. An organism can just simply be a single cell, or, in the more complex form, be made up of millions of cells.

A cell can perform all the seven vital functions that sustain life, as is found in the unicellular organisms. Alternatively, they can become specialized to perform specific functions and work as an integrated whole towards the efficient functioning of the organism, as is found in multicellular organisms. In multicellular organisms, cells are further organized into tissues and organs.

The first cell appeared on Earth about 3.5 billion years ago. Today, wide varieties of different cells abound. The differences in the cells of organisms are sometimes used to classify them into groups. The invention of microscopes has helped us to understand more about the structures and functions of cells.

Student Learning Goals:

1. I can explain that the smallest unit of life is the cell

2. I can describe the cell theory

3. I can handle a microscope safely and successfully focus using different magnifications.

4. I can prepare specimens for examination under a microscope.

5. I can identify the important structures within cells, including the nucleus, cytoplasm, cell membrane, cell wall and chloroplast and their function.

6. I can define multicellular and discuss the concept of specialised cells.

7. I can describe the levels of cellular structure in multicellular organisms as cells, tissues, organs and systems, using skin as an example.

8. I can compare plants cells and animal cells.

9. I can define unicellular and provide several examples of unicellular organisms.

10. I can outline the role of respiration in providing energy for cellular activities.

11. I can list the reasons why cells undergo cellular division.