5.2 Leaves can be tested for starch to show that photosynthesis has taken place. This is the method given in a biology textbook.     1. Remove the leaf you want to test from the plant. 2. Half fill a 250cm3 beaker with water and boil the water using a Bunsen burner. 3. Using a pair of forceps, hold the leaf in the boiling water for 20 seconds. 4. Turn the Bunsen burner off. 5. Using the forceps, push the leaf to the bottom of a boiling tube and cover it with ethanol. 6. Place the boiling tube in the beaker of very hot water. The ethanol will boil. 7. When the leaf is colourless, remove it from the boiling tube and wash it in cold water for a few seconds. 8. Place the leaf flat on a white tile. 9. Add dilute iodine solution with a pipette, making sure the whole leaf is covered. 10. Any starch present will react with the iodine solution.  

5.3.1 light (2)

6.2.1 Use the information in the diagram to compare the Davson-Danielli model with the fluid mosaic model. (2)

8.3 Explain what determines the shape of the active site of an enzyme. (1)

2.2 Describe how the structure of veins ensures the flow of blood in one direction only. (1)

8. Proteases are enzymes used in biological washing powders.  

6. Liposomes are spherical structures composed of phospholipids. They can be made by adding phospholipids to water. Liposomes can be used to study membrane permeability.     The diagram shows a liposome.     Right-click on the blue button to open Fig 6.1        

5. Nucleic acids include DNA and RNA.  Each single strand of a DNA molecule is synthesised from mononucleotides.      Right-click on the blue button to open Fig 5.1        

Katie is a pediatric RN taking care of 6 year old Alexandra. Alexandra is scheduled for an MRI in an hour. Which of the following actions by Katie would be consistent with pre-procedure care for an MRI? Select all that apply.

The nurse is caring for the pediatric patient on furosemide (Lasix) and digoxin (Lanoxin) for congestive heart failure.  Which of the following lab results should be reported to the physician immediately (priority)?