Amoeba: An amoeba is a one-celled animal. Amoebas are found along the bottom of streams and ponds. Within the cell, you can see the nucleus as a large red spot. Because the amoeba is an animal cell, it cannot make its own food. The amoeba eats by extending two foot-like bulges which surround the food. The amoeba continues to extend its body until it has engulfed the food and brought it inside of itself to eat!
Bacteria-Diptheria: Diphtheria is a infection caused by Corynebacterium diphtheriae bacteria. Unlike most other cells, bacteria do not have a true nucleus. Bacteria are some of the oldest and most diverse life forms on Earth. Scientists classify bacteria into three shapes, spiral (spirillum), sphere (coccus), or rod (bacillus).
Paramecium- Paramecium are one-celled animals that live in freshwater ecosystems such as shallow lakes or ponds. Paramecium have vacuoles (small storage areas) inside of them that help the organism by storing food and water. The contractile vacuole of a paramecium allows it to store water. When the water is no longer needed, the sides of the vacuole contract which expels the water from the paramecium's body. Paramecium have hundreds of tiny hairs called cilia which are attached to their outer membrane. These many hairs work like tiny fins to help the organism to move through water.
Phytoplankton - These microscopic plants are phytoplankton (Fye-tow-plank-ton). The ocean does not have trees, forests and prairies. Most of its plants are phytoplankton like these. Too small to see without a microscope, they float near the ocean's surface. They drift wherever the tides and currents may carry them. They produce most of the food in the sea by capturing the energy of sunlight. They are such an important source of food for whales, sharks, sponges and corals, that they have been nicknamed "the pastures of the sea."
Usually phytoplankton are helpful, but sometimes some of them can become killers. This happens when they have ppulation explosions called "red-tides." Red-tides can kill fish, sharks, and even sea turtles. Other phytoplankton can cause the ocean to glow and sparkle in the dark. The phytoplankton you see here are called Diatoms.
Usually phytoplankton are helpful, but sometimes some of them can become killers. This happens when they have ppulation explosions called "red-tides." Red-tides can kill fish, sharks, and even sea turtles. Other phytoplankton can cause the ocean to glow and sparkle in the dark. The phytoplankton you see here are called Diatoms.
Animal Cheek Cell - To make this slide we gently scraped the inner surface of a person's cheek with a toothpick and spread the material on a glass slide. Here we can see the three parts that make up almost all cells. The dark line surrounding each cell is the membrane. Animal cells, unlike plant cells, do not have walls. Some of the oval granules seen near the head of the arrow may not be inside the cell. They are probably some of the bacteria of the mouth clinging to the outer surface of the cell. Cheek cells are thin and flat. In this picture some of the cheek cells are folded over onto themselves.
Animal Bone Cell - This slide was made by taking a thin slice across a bone. Like all other parts of our body, bones are made of living cells. These cells are different from any we have seen because they have a very special job to do. Bones must be strong. To make bones strong these cells manufacture chemical substances. As these chemicals leave the cells they harden in the spaces between the cells. Do you notice the thin lines extending from the cells? Scientists believe that these are canals through which the chemicals travel.
Plant- Onion Skin: Now you are looking at a plant cell. These are from the tissue thin skin which separates that thick layer of the onion. The small red dots are the nuclei of the cells. Observe how these plant cells are very much like the cheek cells above. Both kinds of cells have a covering or membrane around each cell. Inside the cell is a nucleus and cytoplasm. Look carefully and you will see something in the onion's skin cells you did not see in the cheek lining cells. This is the strong protective cell wall which surrounds plant cells just outside the cell membrane. Animal cells do not have cell walls. These onion skin cells are just a few of the millions of cells that make up a single onion plant.
Plant-Leaf Cross Section (use instead of stomate) This is a cross section of a green leaf. The leaf and all the other parts of a tree are made of many different kinds of cells. Do all these cells have the same size and shape? The cell at the top and undersides of the leaf seem to be about the same. A leaf needs water to live. The cells at the V are different, they form a vein through which water flows. We see them as though we were looking down into the hole of a hose. A green plant also needs chlorophyll to help manufacture its food. Can you locate the chlorophyll? The chlorophyll appears as dark green dots near the outer edges of the green cells.
Pictures were acquired from "The Cell: An Image Library." www.cellimagelibrary.org, www.mshernandezscience.pbworks.com, http://www.cdc.gov/ncird/,