Week 1 – Review Sheet Exercise 1: Hanging-drop and wet-mount preparations 1. How does true motility differ from Brownian movement? 2. What morphological structure is responsible for bacterial motility? 3. Why is a wet preparation discarded in disinfectant solution or biohazard container? 4. What is the value of a hanging-drop preparation? 5. What is the value of a wet-mount preparation? Exercise 2: Simple stains 1. Define acidic and basic dyes. What is the purpose of each? 2. What is the purpose of fixing a slide that is to be stained? 3. Why are the specimens to be stained suspended in sterile saline or distilled water? 4. How does a stained preparation compare with a hanging drop for studying the morphology and motility of bacteria? 5. List at least three types of bacteria whose names reflect their shapes and arrangements, and state the meaning of each name. Exercise 3: Gram stain 1. What is the function of the iodine solution in the Gram stain? If it were omitted, how would staining results be affected? 2. What is the purpose of the alcohol solution in the Gram stain? 3. What counterstain is used? Why is it necessary? Could colors other than red be used? 4. What is the advantage of the Gram stain over a simple stain such as methylene blue? 5. In what kind of clinical situation would a direct smear report from the laboratory be of urgent importance?
- What impact will this decision have on the state of the Saudi economy in general?
- Employ effective research skills to identify key sources of information to determine what behavioral methods have been successful for students whose learning needs are similar to those in your data analysis and how progress was monitored.
- What are some of the limitations of this evidence?
- Will use of the individual’s initials or name at the end of the message satisfy the signature requirement, under Article 2B of the Uniform Commercial Code (the UCC)?
- If you were manufacturing toothpaste and decided to substitute diethylene glycol for glycerin, would you consider it
your ethical obligation to tell the consumer?