Biology Preliminary exam (75 marks)
Multiple Choice (5 marks)
Question 1.
Sucrose is dissolved in water and poured into dialysis tubing which is closed on both ends making it water tight, if it is then placed in deionised water, what will happen to the tubing.
- a) It will expand since the solution is hypotonic to the solution in the tubing
- b) It will shrivel up since the solution is hypotonic to the solution in the tubing
- c) It will expand since the solution is hypertonic to the solution in the tubing
- d) It will shrivel up since the solution is hypertonic to the solution in the tubing
Question 2)
Which of the following organs all belong to the digestive system.
- a) The lungs, small intestine, large intestine and stomach
- b) The teeth, oesophagus, small intestine, large intestine and
- c) The bladder, stomach and small intestine
- d) The trachea, gallbladder, liver and large intestine
Question 3)
What is the principle which limits the size a single cellular organism can be
- a) The amount of food around
- b) The SA:V ratio
- c) The diffusion quotient
- d) The concentration of the surrounding environment
Question 4)
What part of the protein does the substrate bind to when a reaction is being catalysed?
- a) The active site
- b) The enzyme
- c) The complex
- d) The Product
Question 5)
What is the role of the arteries in the circulatory system?
- a) To carry blood to the heart
- b) To carry blood away from the heart
- c) To carry oxygenated blood
- d) To carry deoxygenated blood
Short Answer (55 marks)
Question 6. (6 marks)
Evaluate the use of models in science [6 marks]
Question 7. (3 marks)
Compare and contrast the circulatory system of animals with the transport system of plants. [3 marks]
Question 8. (4 marks)
Draw and label an animal cell which contains the following organelles:
- Mitochondria (1 mark)
- Nucleus (1 mark)
- Ribosomes (1 mark)
- Golgi apparatus (1 mark)
Question 9. (6 marks)
- Outline the body systems and their major role which allow for cellular respiration. [3 marks]
- Outline how the SA:V concept allows the above three systems to work more effectively [3 marks]
Question 10. (9 marks)
During your studies, you performed an experiment which allowed you to determine the effect of an enzyme on the rate of reaction.
a) Outline your independent, dependent and controlled variables you used in this experiment. (3 marks)
b) Write a risk assessment for your experiment (2 marks)
c) Evaluate the experimental procedure you used (4 marks)
Question 10. (3 marks)
Explain how enzymes work using the lock and key model and why they have their effect on the rate of reaction. (3 mark)
Question 11. (3 marks)
Outline the effect of the following changes to reaction rate
a) Increasing temperature (1 mark)
b) Increasing concentration of the substrate (1 mark)
c) Increasing concentration of enzyme (1 mark)
Question 12. (6 marks)
Evaluate the usefulness of the SA:V ratio for explaining biological phenomena. (SA:V)
E.g limits the size a cell can grow
Outline the experimental method and risk assessment you used for the enzyme experiment (6 marks)
Question 13. (8 marks)
- a) Compare and contrast scanning electron microscopes, transmission electron microscopes and light microscopes. ( 6 marks)
Label the two missing organelles (2 marks)
Question 14. [8 marks]
In you diffusion experiment you measured the net flow of water and the effect of concentration gradient on this:
- What was the role of the dialysis tubing – what was it modelling
- State a hypothesis
- You had two controls, what were they?
- What were the controlled variables?
Question 15. (6 marks)
the experimental method and risk assessment you used for the enzyme experiment (6 marks)
Question 16. (4 marks)
A student says
“Plants don’t respire because they can perform photosynthesis”
Evaluate the validity of the students statement [4 marks]
Answers.
- A
- B
- B
- A
- B
6)
Marking Criteria:
| Criteria | Mark |
| Provides an advantage/s of models in scienceE.g communicating ideas effectively, allowing complex systems to be represented | 1 |
| Provides an example of this advantage | 1 |
| Provides a diavantage/s of models in scienceE.g communicating ideas effectively, allowing complex systems to be represented | 1 |
| Provides an example of this disadvantage | 1 |
| Uses evaluative language | 1 |
| Evaluates the effectiveness in models | 1 |
7)
Sample Answer:
| Plants | Animals | |
| Sim | Both are transporting nutrients, water and energy | |
| Diff | Source and sink, capillary action & adhesion & cohesion Phloem and xylem | The movement of blood around body is powered by heart Arteries, capillaries, veins |
Compare and contrast gaseous exchange in plants and mammals [4 mark]
Autotoph – plant
Heterotroph – mamals
| Sim | Diff | |
| Plants | Respiration common to both (O2 being used)Stomata and mouths and nose | They can chose to photosynthesis |
| Animals | We only produce CO2 |
Question 16.
The Student’s statement is invalid.
- Chloroplasts convert light into glucose
- Plants do respire
- Plants are also photosynthesising and respiration during the day
