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JC Biomolecules

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Question
Answer
How many biomolecules are there? What are they?   4. Proteins, fats, carbohydrates, vitamins  
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What is the function of proteins?   growth and repair of cells. Makes muscle, hair and enzymes.  
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What is the function of fats?   Supply and store energy, insulate the body, protect internal organs (e.g. kidneys)  
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List the 3 different types of carbohydrates   starch, sugar, fibre  
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What are the functions of carbohydrates?   Slow release of energy (from starch and fibre) and fast release of energy (sugar), help food move through the intestines to prevent constipation (fibre)  
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What is the function of vitamin C?   Keeps gums healthy, forms strong bones  
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What is the function of Vitamin D?   Forms strong bones  
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List 4 reasons we need food?   To grow, give us energy, repair any damage to the body, to prevent disease  
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List some sources of protein   eggs, meat, poultry, fish, milk, cheese, nuts, peas, beans  
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List some sources of fats   oils, butter, cream, milk  
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List some sources of vitamins   fruit, green vegetables, potatoes, milk, cheese, fish liver oil  
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List some sources of starch   bread, potatoes, rice, pasta  
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List some sources of sugar   fruits, honey, sweets  
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List some sources of fibre   cereals, brown bread, fruit and vegetables  
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What happens when foods containing fat are rubbed onto brown paper?   They turn translucent  
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What happens when iodine is added to foods containing starch?   They turn blue/black  
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What chemical is used to test for starch?   Iodine  
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What chemicals are used to test for protein?   sodium hydroxide and copper sulfate  
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What chemical is used to test for a reducing sugar (glucose)?   Benedict's Solution  
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What colour does Benedict's solution change when in the presence of reducing sugar (glucose)?   Brick Red  
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What colour change occurs when testing for protein?   Blue - purple/lilac  
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What acts as the control in the food tests?   Water  
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