Nutrition and food tests Flashcards
What is the chemical test for starch?
When iodine solution is added to a food sample containing starch, it turns from yellow-brown to blue-black.
What is the function of water in the diet?
Water is used as a sovlent in the diet.
Fat is needed in the diet for energy and what other function?
Fat is needed in the diet for energy and insulation.
A brick red precipitate forms when a solution is heated with Benedict’s reagent. What could this solution contain?
When Benedict’s reagent is added to glucose and boiled in a water bath, a brick red precipitate forms.
Which component of the diet prevents constipation?
Fibre prevents constipation.
Which of these can cause skin cancer?
UV rays Too much UV radiation from the Sun or sun beds can cause mutations in the skin that can lead to skin cancer. This is preventable by spending less time in the sun and using sunscreen.
Which substance in tobacco can cause emphysema?
Tar ….Tar has a number of harmful effects. It causes bronchitis – narrowing of the bronchi and bronchioles, emphysema – alveolar damage reducing the surface area of gas exchange and lung cancer – abnormal cell division.
What is a long-term effect of excessive alcohol use?
Drinking alcohol excessively over a long period of time can damage the liver and other organs.
Binge drinking can cause harm to the individual and others. Binge drinking is when a large amount of alcohol is consumed over a short period of time.
Why are proteins important in a balanced diet?
Protein is used for the growth and repair of cells and can be used as a source of energy if carbohydrate and fat reserves are low.
Which biological molecule contains the most energy?
Fats are a store of energy, providing double the amount that carbohydrates and proteins do.
Which reagent is used to test for the presence of fat?
Ethanol
When used on a food sample containing fat, ethanol will turn into a white emulsion when water is added.
