Unit 1 Biology June 2013

1. A platelet





2. Thrombin is





3. Fibrinogen is





Use the following diagram to answer Questions 4 to 6:

4. Choose the molecule represented by the letter X





5. Choose the molecule represented by the letter Y





6. Select the name of the bonds holding the two strands of DNA together.





Use the following information below to answer Questions 7 and 8:

7. Choose the tube showing the correct DNA pattern after the bacteria have divided once.





8. Choose the tube showing the correct pattern of DNA after the bacteria have divided twice