Podcast
Questions and Answers
What is the primary function of lipase in the digestive system?
What is the primary function of lipase in the digestive system?
Which food test reagent produces a blue-black color when a positive result is detected?
Which food test reagent produces a blue-black color when a positive result is detected?
What is the breakdown product of starch during digestion?
What is the breakdown product of starch during digestion?
During digestion in the stomach, which substance helps to create an optimum pH for protease enzymes?
During digestion in the stomach, which substance helps to create an optimum pH for protease enzymes?
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What does the formula for calculating energy released from food per gram take into account?
What does the formula for calculating energy released from food per gram take into account?
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Which digestive enzyme is secreted by the pancreas into the small intestine?
Which digestive enzyme is secreted by the pancreas into the small intestine?
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Which of the following correctly describes the role of proteases in digestion?
Which of the following correctly describes the role of proteases in digestion?
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What color change indicates a positive result when using Benedict's solution to test for glucose?
What color change indicates a positive result when using Benedict's solution to test for glucose?
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Study Notes
Digestive Enzymes
- Proteins are broken down into amino acids by proteases. This aids in growth and repair of tissues.
- Fats (lipids) are broken down into fatty acids and glycerol by lipases. This provides energy and insulation.
- Starch (carbohydrates) are broken down into glucose by amylase (carbohydrase). This provides energy.
Food Tests
- Protein is tested using Biuret reagent. A positive result is a lilac color.
- Starch is tested using iodine solution. A positive result is a blue-black color.
- Glucose is tested using Benedict's solution. A positive result is a change in color from green to blue to orange ppt (precipitate).
Digestion Process
- Food is chewed and mixed with saliva containing amylase in the mouth.
- The food travels down the oesophagus to the stomach.
- The stomach secretes protease to break down proteins into amino acids and hydrochloric acid to kill bacteria.
- The food then moves to the small intestine.
- Pancreatic secretions (lipases, proteases, carbohydrases) enter the small intestine.
- Carbohydrates are broken down into glucose.
- Proteins are broken down into amino acids.
- Fats are broken down into fatty acids and glycerol.
- Any undigested material passes into the large intestine where water is absorbed, forming faeces that are eliminated.
Calculating Energy Content of Food
- Calculate the energy released by measuring the initial and final temperature of water surrounding a burning food sample using this formula: Energy (J) = mass of water (g) * temperature rise (°C) * 4.2/mass of food sample (g)
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Description
Explore the fascinating world of digestive enzymes and food testing with this quiz. Learn how proteins, fats, and carbohydrates are broken down in the body, and test your knowledge on identifying nutrients using various reagents. Perfect for reinforcing your understanding of digestion and nutrition!
