AS Level Biology Practice Test

1.An enzyme hydrolyses a phospholipid molecule to release a fatty acid.What is the name of the bond that is broken in this hydrolysis reaction?
Ester
Glycosidic
Peptide
Phosphodiester

2.Convalescent plasma immunity is one method used to treat patients infected with Ebola virus disease (EVD). In this method, blood plasma is taken from a person who has recovered from EVD and is injected into the patient with the EVD infection. Which of the options describes this form of immunity?
Artificial active immunity
Artificial passive immunity
Natural active immunity
Natural passive immunity

3.A student is studying three unicellular organisms: the bacterium Escherichia coli, the protoctist Euglena gracilis and the fungus Saccharomyces cerevisiae. Which feature is common to all three unicellular organisms?
Cell wall
Mitochondria
Nucleus
Ribosomes

4.Which option describes the correct process of blood clotting?
Platelets convert into insoluble fibrin to trap erythrocytes.
The insoluble plasma protein fibrinogen converts into soluble fibrin to trap erythrocytes.
The soluble plasma protein fibrinogen converts into insoluble fibrin to trap erythrocytes
The soluble plasma protein fibrinogen converts into soluble fibrin to trap erythrocytes

5.Diseases can be caused by many different types of pathogen. Which row matches the disease to the correct pathogen?

A
B
C
D

6.The diagram shows the changes in pressure in the left atrium, left ventricle and aorta in a single cardiac cycle.Which letter shows the point at which the semilunar valve opens?

A
B
C
D

7. Fick’s Law describes the relationship between the rate of diffusion and factors that affect this rate. This can be simplified as the equation: Rate of diffusion α (surface area × concentration gradient) / thickness of surface Inhalation of asbestos dust can cause a thickening of the alveolus wall. Which option shows the change in the rate of diffusion if the alveolus wall increases from a thickness of 2.0 μm to 2.5 μm?
Decreases by 20%
Decreases by 50%
Increases by 20%
Increases by 50%

8.Cells in the leaves of plants synthesise amino acids. Which of the statements explains why plants need a vascular system to support amino acid synthesis?
To transport amino acids to the roots using xylem tissue
To transport nitrates to the leaves using phloem tissue
To transport nitrates to the leaves using xylem tissueTo transport sucrose to the leaves using phloem tissue
To transport sucrose to the leaves using phloem tissue

9.The table shows the dimensions of a dividing ball of cells and their surface area to volume ratios.

7 : 4
3 : 2
5 : 4
1 : 1

10. The temperature coefficient (Q10) for catalase is recorded in a data book as 1.15. A student carries out an experiment to test if this Q10 value is correct and collects data with a high level of precision and accuracy. Which row shows the correct definition of both precision and accuracy for their data?
Choose the correct answer from the options below

A
B
C
D

Score =
Correct answers: