1.33 Which of the following reactions take place in a capillary of an active tissue?   1.    Carbonic acid is formed from carbon dioxide and water 2.    Haemoglobin and hydrogen ions are formed from haemoglobinic acid 3.    Carbaminohaemoglobin is formed from carbon dioxide and haemoglobin 4.    Carbon dioxide and water are formed from hydrogencarbonate ions and hydrogen ions (1)       A) 1 and 3 only   B) 1, 2, 3 and 4   C) 1 and 2 only   D) 2 and 4 only    

1.29 Which one of the following instruments can be used to hear the movement of heart valves? (1)       A) Cardioverter   B) Endoscope   C) Stethoscope   D) Sphygmomanometer  

1.24 Ricin is a toxic protein which inactivates ribosomes. Which effect will this have on protein synthesis? (1)       A) Anticodons on mRNA molecules will not base pair to codons on tRNA molecules   B) Peptide bonds will not form between adjacent amino acids in the growing polypeptide   C) Amino acids will be unable to bind to the binding sites on specific tRNA molecules   D) RNA nucleotides will be unable to join by condensation reactions for form rRNA  

6. Fig. 6.1 is a photomicrograph of some xylem vessels.     Right-click on the blue button to open Fig. 6.1      

5.1.1 Describe and explain the results shown in Table 5.1 (3)

5.3 The cholera bacterium can survive in the small intestine and the large intestine. The bacterium releases a toxin that interacts with receptors on the surface of cells. Fig. 5.3 shows the effect of the toxin. The arrows indicate the direction of movement.     Right-click on the blue button to open Fig. 5.3       5.3.1 State the name of ion X. (1)

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)

3. One of the characteristics of living organisms is sensitivity   3.1 Define the term sensitivity. (2)

1.1 Identify the structures labelled A, B and C in Fig. 1.1. (3)      

3.3.3 Another group of rats was given an injection that did not contain adrenaline. These rats were given food after 2 hours of monitoring. Predict the changes to blood glucose concentration in this group of rats and explain where you will draw the new line to explain your prediction on the graph in Fig. 3.1. (USE DATA TO BE SPECIFIC IN YOUR EXPLANATION) (2)