Question

D. Answer the following questions.
1. What is a cell?
2. What are unicellular organisms? Give two examples.
3. How are unicellular organisms different from multicellular organisms?
4. List the levels of organization in a multicellular organism.
5. What is a specimen? What do we use to view a specimen?
6. What is a coverslip? Why do we use it in preparing a slide?
7. Describe the stepwise process of preparing a slide.​

Answer 1

Answer:

1. Cell is a structural and functional unit of living organisms or life.

Answer 2

Answer:

1. Cells are the basic building blocks of all living things. ... Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.
2. Amoebas, bacteria, and plankton are just some types of unicellular organisms. They are typically microscopic and cannot be seen with the naked eye.
3. Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. ... Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions.
4. Living organisms are made up of four levels of organization: cells, tissues, organs, and organ systems.
5. In clinical settings, light microscopes are the most commonly used microscopes. There are two basic types of preparation used to view specimens with a light microscope: wet mounts and fixed specimens. The simplest type of preparation is the wet mount, in which the specimen is placed on the slide in a drop of liquid.
6. The main function of the cover slip is to keep solid specimens pressed flat, and liquid samples shaped into a flat layer of even thickness. This is necessary because high-resolution microscopes have a very narrow region within which they focus. The cover glass often has several other functions.
7. To prepare the slide:

• Place a drop of fluid in the center of the slide.
• Position sample on liquid, using tweezers.
• At an angle, place one side of the cover slip against the slide making contact with outer edge of the liquid drop.
• Lower the cover slowly, avoiding air bubbles.
• Remove excess water with the paper towel.