Figure 4 shows the human digestive system - AQA - GCSE Biology - Question 6 - 2018 - Paper 1
Question 6
Figure 4 shows the human digestive system.
Many people suffer from stomach ulcers caused by a species of bacteria called Helicobacter pylori.
The stomach is lined ... show full transcript
Worked Solution & Example Answer:Figure 4 shows the human digestive system - AQA - GCSE Biology - Question 6 - 2018 - Paper 1
Step 1
Label the stomach and pancreas on Figure 4.
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Answer
The stomach and pancreas should be clearly labeled on the diagram to identify these organs.
Step 2
Suggest how an infection with Helicobacter pylori might result in a stomach ulcer developing.
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Answer
Helicobacter pylori bacteria are not killed by stomach acid (HCl), allowing them to damage the protective mucus lining of the stomach. The bacteria can then infect stomach tissues, leading to ulcers as the stomach acid can directly harm the exposed tissue.
Step 3
Describe how a person infected with Helicobacter pylori could develop liver cancer.
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If the cancer is malignant, Helicobacter pylori infections can lead to cancerous cells that spread to other organs via blood, forming secondary tumors, including potential liver cancer.
Step 4
Describe the test you would use to find out if protein is present in food:
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To test for protein, you would use the Biuret reagent. The procedure involves adding the Biuret reagent to the food sample; a mauve or purple color change would indicate that protein is present.
Step 5
Suggest why a person with coeliac disease might have this symptom.
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A person with coeliac disease may experience poor growth due to the damaged villi in the small intestine, which reduces the surface area available for the absorption of nutrients. This leads to deficiencies in essential nutrients needed for growth.
