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1.37 The water potential of soil growing maize is  

1.23 Which of the following occurs during DNA replication, transcription, and translation?     1.    Condensation reactions occur to form a polymer 2.    ATP provides energy 3.    Hydrogen bonds form between purine and pyrimidine bases (1)       A) 1 and 2 only   B) 1, 2 and 3   C) 2 only   D) 3 only  

1.28 Which one of the following is a product produced by the action of carbonic anhydrase? (1)       A) Haemoglobinic acid   B) Carbaminohaemoglobin   C) Hydrogencarbonate ions   D) Oxyhaemoglobin    

1.38 Which one of the following aids in maintaining the necessary concentration gradients for carbon and oxygen in the lungs? (1)       A) Large surface area of the alveoli   B) The walls of the alveoli are thin   C) The capillaries are close to the walls of the alveoli   D) Good ventilation of the lungs  

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19. What is produced by anaerobic respiration in mammals? (1)

17. The diagram shows a circulatory system.     Right-click on the blue button to open Figure 17.         Which vessels carry oxygenated blood? (1)

6.1.2 Explain the mechanism that is responsible for the movement of water in xylem vessels. (4)

5.2 Fig. 5.2 shows a drawing of a cell from the lining of the small intestine. The lumen is the space inside the intestine where food is digested.     Right-click on the blue button to open Fig. 5.2       5.2.1 State the names of the three labelled structures in Fig. 5.2 and describe the role of each structure in the intestinal cell. (6)

1.3.2 Many countries have laws that ban smoking in public buildings. Discuss the evidence from Table 1.1 that supports these laws. (3)