The Science of The Cell!
The Science Cell Unit!
Plant and Animal Cells
Plant and animal cells look very different from one another. One of the main differences between an animal cell and a plant cell is that an animal cell has a cell membrane and an plant cell has a cell membrane + a cell wall. Another main different between plant and animal cells is that a plant cell has chloroplasts that are instrumental in the process photosynthesis.
Multicellular and Unicellular Organisms
An Amoeba is a slow moving organism. It's not a fixed shape. It digests food by enveloping the food and absorbing food and breaking it down.
An Euglena is a large unicellular protist. It has both plant and animal cell characteristics.
Bacteria is a multicellular plant cell. This is one of 3 types of bacteria. This is the rod shape bacteria and it also has a flagellum.
Extra Information and Facts
Many years ago, scientists made observations with their eyes. When the microscope was invented, scientists were able to see cells for the very first time. Because of these advancements, scientists came up with the cell theory. The cell theory states the following:
1. All living things are made up of one or more cells.
2. The cell is the basic unit of life.
3. All cells come from other living cells.
Plant and animal cells are different in some respects and the same in other respects. One main difference is that the plant cell has a cell wall and an animal cell has a cell membrane. Plant cells also have structures called chloroplasts which helps the plant cell in getting energy by photosynthesis.
In the leaf, fluid movement and gas exchange is controlled by structures called stomata. On either side of the stomata are structures called guard cells. These structures let in water and let out gas. When the weather is dry, the guard cells deflate and close off the opening keeping the leaf from becoming dry. When there is an abundance of water and water vapor in the air, the guard cells swell with water and create an opening where there is an exchange of water and gases.