OCR AS Biology 1

Welcome to your OCR AS Biology 1

1. The enzyme responsible for forming hydrogen bonds during the process of DNA replication.
2. In complex multicellular organisms, eukaryotic cells become _________ for specific functions.
3. Select the incorrect statement regarding haemoglobin.
4. What happens when a Biuret reagent is added to a solution of free amino acids?
5. How many oxygen molecules at a time could be carried by a haemoglobin molecule?
6. Many prokaryotic cells do not have __________________.
7. Prokaryotic cells have a cell wall that contains ________.
8. The most common protein found in animals.
9. Which organelle is referred as the 'Powerhouse of the cell'?
10. Network of tiny tubes within the cytoplasm.
11. Prokaryotic cells have a single ___________ instead of a nucleus.
12. Which is not a virus among the following?
13. Which of the following is a double membrane bound organelle?
14. Which of the following solutions turn milky white upon adding ethanol and water?

a) A slice of potato
b) Milk
c) Palm oil
d) A piece of apple
15. Which indicates an indirect evidence for evolution?
16. Component of plant cell wall.
17. How many oxygen molecules at a time could be carried by a haemoglobin molecule?
18. Which is not a function of golgi bodies?
19. The site of ribosome formation.