Virtual Lab – Microscopy – Plant Cells (Onion Epidermal Cells) Why must the specimen be centered before switching to a higher magnification?

Nitroglycerin is infusing at 5.2 mL/hr for a client weighing 168 pounds. The nitroglycerin solution has 100 mg in 500 mL D5W. Determine the rate in mcg/min that the drip is infusing.  Do not provide the unit of measurement. Only provide the number. Round to one decimal place (tenths).

Review the error free lines of code below.  public class A { // In A.java     public String toString() { return “A”; }    public String sA() { return “1”; }    public int valA = 1; } public class B extends A { //In B.java     public String toString() { return “B”; }    public String sB() { return “2”; }    public int valB = 2;}public class C extends B {} //In C.javapublic class D extends A {} //In D.javaFor each code snippet (A – F) below (each is independent of the others), indicate its result (on the right). Assume that each snippet is run in a main method of a class. More specifically, you must indicate one of the following:  the output of the code, if the code runs properly the type of runtime error (it is the name of the java class representing a kind of exception) and the statement that caused it (write the statement down), if the code compiles but doesn’t run properly Which statement(s) don’t compile (circle them) and why, if the code doesn’t compile when put in a main method A). A a = new C();      System.out.print(((B)a).sA()); B). A a = new B();      System.out.print(a.sB()); C). B b = new C();      A a = b;      System.out.print(a.toString()); D). B b = new A();      System.out.print(b.toString()); E). D d = new D();      A a = (A) d;      B b = (B) a;      System.out.println(b.valA + b.valB); F). C c = new C();      System.out.print((D) c);

Virtual Lab – Operation of Bright Field Microscope When using the 100X objective lens, a drop of water is needed on the specimen slide. 

Virtual Lab – Microscopy – Wet Mount (Euglena) What similarities and differences do you see between the plant cells (onion and Elodea) and the Euglena? Similarities: All three types of cells (onion, Elodea, and Euglena) contain a cell membrane, cytoplasm, and a nucleus. They have chloroplasts (Elodea and Euglena) or can contain pigments involved in photosynthesis. Differences: Onion Cells: Onion cells are typically rectangular and lack chloroplasts as they are not photosynthetic. They have a large central vacuole and a rigid cell wall. Elodea Cells: Elodea cells are rectangular or box-like and contain chloroplasts for photosynthesis. They have a cell wall and a central vacuole. Euglena: Euglena is unicellular and has a flexible outer membrane called a pellicle rather than a rigid cell wall. It has chloroplasts for photosynthesis but also can consume food from the environment. Euglena also features a flagellum for movement.

Virtual Lab – Microscopy – Wet Mount (Euglena) In a wet mount preparation: The glass piece that forms the base is called the cover slip. The glass that covers the top of the specimen is called the slide.

Virtual Lab – Microscopy – Wet Mount (Euglena) What organelle assists the Euglena in osmoregulation?

Virtual Lab – Microscopy – Animal Cells (Human Epidermal Cells) Why was a stain added to the human epidermal cells from the cheek smear prior to microscopic observation?

Virtual Lab – Microscopy – Animal Cells (Human Epidermal Cells) If you were given a slide of cells from an unknown organism, you could determine whether the cells are from a plant or an animal by looking for the cell wall, chloroplasts, and a vacuole.

How is pH paper used to determine the pH of a solution?