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Unlike bacteria, all protists have a nucleus so they are Eukaryotic Cells. Some protists live in water. They live in lakes, streams, ponds and in the ocean. ...
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After the microscope was improved scientists were able to see inside living cells. Living cells have parts inside called organelles. Organelles are tiny structures inside cells that help the cell carry out life processes. The most important organelle of most cells is called the nucleus. The nucleus can be thought of as the brain of the cell. It directs the cell’s activities. Cells with a nucleus are called Eukaryotic Cells and cells without a nucleus are called Prokaryotic Cells. The protists are a kingdom of very simple organisms. Most protists are made up of only one cell. Some are many-celled. Unlike bacteria, all protists have a nucleus so they are Eukaryotic Cells. Some protists live in water. They live in lakes, streams, ponds and in the ocean. Some live in moist soil. Some even live in the bodies of animals. With its single cell, a protist does everything that you do in order to keep alive. A one-celled protist moves. It eats. It breathes. It excretes wastes. It reproduces. It senses what is going on around it. These are all the functions that all living things must do. Like other cells, a protist has a cell membrane, cytoplasm, and a nucleus or several nuclei. Because the protist has to do everything with its single cell, there are many other structures within the cell as well.
The amoeba has no definite shape and no cilia. It moves by stretching out pseudopods or “false feet” and flowing into them. This shapelessness helps the amoeba eat. The amoeba flows around bacteria, smaller protists, or small plants. Then it encloses the food in a vacuole and digests it. What structure does an amoeba use to move?
What structure does an amoeba use to capture food?
Based on the reading, choose the best answer to each question.
What structure does a euglena use to make food?
Paramecium is one of the most common protists. Look at the picture to the right and find the tiny little hairs called cilia. It swims with the cilia. It also spins, bends and flops around. Paramecia also eat with their cilia. They sweep food into their mouth opening and into bubbles called vacuoles. The food is digested in these vacuoles. Then the vacuole bursts and the wastes pass out. Notice the star-shaped vacuoles. They are called contracting vacuoles. They fill with water and then squeeze the water out. Color coding organelles – follow the directions to correctly color the parts of the protists.