7.4. Chemical digestion
A subsection of Biology, 0610, through 7. Human nutrition
Listing 10 of 114 questions
Table 6.1 shows some of the enzymes, their substrates, products and where they are produced in the digestive system. Complete Table 6.1. Table 6.1 enzyme substrate productlocation of enzyme production starch salivary glands maltase maltose amino acids stomach wall amino acids pancreas and small intestinal wall lipase fats Bile is made in the liver, stored in the gall bladder and passes into the small intestine. Describe the role of bile in digestion. After chemical digestion the products of digestion are absorbed. Define absorption. Lack of protein in the diet can result in protein-energy malnutrition. State the name of one disease caused by protein-energy malnutrition. People that eat a diet that is high in fats are often advised to reduce their intake of fats. Suggest the health benefits of this change in diet.
0610_m17_qp_42
THEORY
2017
Paper 4, Variant 2
View
Define the term chemical digestion. A student investigated the activity of the digestive enzyme pepsin. shows the apparatus used in the investigation. test-tube 1 egg white solution and pepsin test-tube 2 egg white solution, pepsin and hydrochloric acid test-tube 3 egg white solution, boiled pepsin and hydrochloric acid test-tube 4 egg white solution and hydrochloric acid stop-clock The appearance of the four test-tubes was recorded at 0 and 5 minutes. The protein in the egg white solution gives the solution a cloudy appearance. The cloudy appearance clears when the protein in the egg white solution breaks down. Table 6.1 shows the results. Table 6.1 test-tube contents appearance at 0 mins appearance after 5 mins egg white solution, pepsin cloudy less cloudy egg white solution, pepsin, hydrochloric acid cloudy clear egg white solution, boiled pepsin, hydrochloric acid cloudy cloudy egg white solution, hydrochloric acid cloudy cloudy Explain the results shown for test-tubes 1, 2 and 3 in Table 6.1. Explain the purpose of test-tube 4. State the name of the organ in the body that produces pepsin. Maltase is another digestive enzyme. Describe the action of maltase and state where it acts in the alimentary canal.
0610_m18_qp_42
THEORY
2018
Paper 4, Variant 2
View
Questions Discovered
114