Unit 2 Biology June 2012

Use the following to answer Questions 1 and 2: Before a new drug can become available for use it has to pass a contemporary drug testing protocol. This includes three-phased testing. A drug may fail at any of the three phases

1. The drug did not improve the condition it was designed to treat in humans.

2. The effect of the drug was different in humans from its effect in animals.

3. The organ shown in the diagram is a

4. Two tissues that contain lignin are labelled