click below
click below
Normal Size Small Size show me how
Food - Nutrition
Leaving Cert Biology
Question | Answer |
---|---|
Name the 4 major biomolecules | Carbohydrates, Lipids, Proteins and Vitamins |
What elements are present in carbohydrates | Carbon, Hydrogen and Oxygen |
In what ratio are the elements present in a carbohydrate | 1:2:1 |
What is the smallest unit of a carbohydrate | Monosaccharide |
Name 2 monosaccharides | Glucose and Fructose |
What is the main function of glucose | Main molecule from which organisms get their energy -Respiratiion |
What are two monosaccharides joined together called | Disaccharides |
Name 2 common disaccharides | Sucrose (Table sugar) and Lactose (Milk) |
What do you call a long chain of monosaccharides | Polysaccharides |
Name 2 common polysaccharides | Starch and Cellulose |
Why is starch easily digested | Because the monosaccharides are arranged in a long straight line |
Excess glucose made in plants by photosynthesis is stored as what? | Starch |
Excess glucose in animals cannot be stored what is it converted to | Glycogen (in muscle) |
Why is cellulose difficult to break down (digest) | Beacuse monosaccharides are present in long interconnecting chains with alot of crossbonding |
Where would you find cellulose | Plant cell walls |
What is function of cellulose in plant cell walls | Provides strength |
What elements do Lipids contain | Carbon , Hydrogen and Oxygen (no set ratio) |
Lipids contain fats and oils, what is difference between both | Oils are liquid are room temp, fats are solid |
What do you call the smallest unit of a lipid | Triglyceride or Phospholipid |
What is a triglyceride made up of | 1 glycerol and 3 fatty acids |
What is a phospholipid made up of | 1 glycerol, 2 fatty acids and 1 phosphate |
In what cell structure would you find phospholipids | Cell membrane |
What elements are present in protein | Carbon, Hydrogen, Oxygen and Nitrogen (no set ratio) |
What is the smallest unit of a protein | Amino acid |
What do you call a short chain of amino acids (up to 20) | Peptide |
What do you call a chain of up to 200 amino acids | Polypeptide |
What do you call a chain of up to 200+ amino acids | Protein |
Name a structural role of a carbohydrate | Cellulose in cell wall |
Name a metabolic role of a carbohydrate | Respiration, breakdown of glucose for energy |
Name a structural role of a carbohydrate | Phospholipid bi-layer in membranes |
Name a metabolic role of lipid | Release and storage of energy |
Name a structural role of a protein | Keratin in hair and nails |
Name a metabolic role of a protein | All enzymes are proteins - control metabolic reactions |
Name the organic substances that the body requires in small amounts but cannot make | Vitamins |
Vitamins are divided into two groups, what are they | Water soluble and Fat soluble |
What are the Water soluble vitamins | B and C |
What are the Fat soluble vitamins | A, D, E and K |
Name a good source of Vit C | Citrus fruits |
Name a good source of Vit D | Sunlight and Fish oils |
Name a disease caused by the deficiency of Vit C | Scurvy (poor healing of skin and poor gums) |
Name a disease caused by the deficiency of Vit D | Rickets or Osteomalacia |
Name the inorganic substances that the body requires in small amounts but cannot make | Minerals |
Name 2 common elements required by plants | Calcium (Ca) and Magnesium (Mg) |
Name a function of Ca in plants | Helps form middle lamella between plant cells |
Name a function of Mg in plants | Forms part of chlorophyll |
Name 2 common elements required by animals | calcium (Ca) and Iron (Fe) |
Name a function of Ca in animals | Helps form healthy teeth and bones |
Name a function of Fe in animals | Forms part of hemoglobin |
Name 3 functions of water in cells | Universal solvent, Medium for chemical reactions, Regulates body temperature |
What do you call the test for fat | Brown paper test |
What happens to paper if fat is present | Translucent spot |
What chemical is used to test for starch | Iodine |
If starch is present, what colour change occurs | Yellow to blue/black |
What chemical is used to test for protein | Biuret reagent |
If protein is present, what colour change occurs | Blue to Violet |
What chemical is used to test for reducing sugar (glucose) | Benedicts |
If glucose is present, what colour change occurs | Blue to brick red AFTER HEATING |
What is a catabolic recation | Reactions where larger molecules are broken down and energy is released |
What is an anabolic reaction | Reactions where smaller molecules are used to form a larger one and energy is taken in |