What Do You Think Might Have Happened And How Could This Be Avoided?
1. You are looking at a Euglena using the x10 objective lens. You rotate the nosepiece around to x40 but the specimen is not visible. Describe what you should do next?
Start by using the fine adjustment to attempt to focus on the Euglena. However, if it is still not visible, return to the x10 objective lens and use the fine adjustment to ensure the Euglena is as sharply focused as possible. Then, use the stage control to re-position the slide so the Euglena is directly in the centre of the lens. Return to the x40 objective lens, and the Euglena should be visible.
2. The sound of a glass slide cracking is heard during a lab class. What do you think might have happened and how could this be avoided?
A glass slide cracking is likely caused by …show more content…
Refer to the image of cheek cells below. Describe two OBSERVABLE features that confirm it is an animal cell.
The large, darker purple circle in the centre of each cell is a nucleus. The nucleus is a membrane-bound organelle which contains the genetic information, and indicates that the cell is a eukaryotic cell and thus either an animal or plant cell. The cell also has a cell membrane, which is a phospholipid bilayer separating the cell from the surrounding environment and controlling the passage of substance into and out of the cell, but no cell wall. Thus, it is an animal cell as animal cells are the only cells that consistently do not have a cell wall.
5. Refer to the image of Elodea leaf cells below. Describe two OBSERVABLE features that confirm it is a plant cell.
The thick layer around each cell is the cell wall, a rigid layer outside the cell membrane that gives the cell structure and support. Its present indicates that the cell is either a prokaryote or plant cell. The small green organelles within each cell are chloroplasts. Chloroplasts facilitate photosynthesis and are only found in plant cells; thus their presence confirms that the cell is a plant cell.
6. Refer to the Summary Table on Cells. Include your repsonses for the following structures.
a.
Start by using the fine adjustment to attempt to focus on the Euglena. However, if it is still not visible, return to the x10 objective lens and use the fine adjustment to ensure the Euglena is as sharply focused as possible. Then, use the stage control to re-position the slide so the Euglena is directly in the centre of the lens. Return to the x40 objective lens, and the Euglena should be visible.
2. The sound of a glass slide cracking is heard during a lab class. What do you think might have happened and how could this be avoided?
A glass slide cracking is likely caused by …show more content…
Refer to the image of cheek cells below. Describe two OBSERVABLE features that confirm it is an animal cell.
The large, darker purple circle in the centre of each cell is a nucleus. The nucleus is a membrane-bound organelle which contains the genetic information, and indicates that the cell is a eukaryotic cell and thus either an animal or plant cell. The cell also has a cell membrane, which is a phospholipid bilayer separating the cell from the surrounding environment and controlling the passage of substance into and out of the cell, but no cell wall. Thus, it is an animal cell as animal cells are the only cells that consistently do not have a cell wall.
5. Refer to the image of Elodea leaf cells below. Describe two OBSERVABLE features that confirm it is a plant cell.
The thick layer around each cell is the cell wall, a rigid layer outside the cell membrane that gives the cell structure and support. Its present indicates that the cell is either a prokaryote or plant cell. The small green organelles within each cell are chloroplasts. Chloroplasts facilitate photosynthesis and are only found in plant cells; thus their presence confirms that the cell is a plant cell.
6. Refer to the Summary Table on Cells. Include your repsonses for the following structures.
a.