click below
click below
Normal Size Small Size show me how
LC Biology chapter 3
nutrition
Term | Definition |
---|---|
nutrition | how organisms obtain and use food |
metabolism | sum of all the chemical reactions in an organism, catagories - anabolism, catabolism |
continuity of life | way in which organisms arise from other organisms of the same type |
6 constituents of food | carbohydrates, vitamins, lipids, proteins, minerals, water |
carbohydrates | biomolecule, Cx(H2 O)y |
biomolecules | organic chemicals produced and found only in living organisms, lipids, carbohydrates, proteins, vitamins |
monosaccharides | simplest type of carbohydrate 'one sugar unit', C6 H12 O6, sweet taste, soluble in water, energy source |
disaccharides | 2 monosaccharides covalently combined C12 H22 O11, sweet taste, soluble in water, energy source |
6 common elements present in living organisms | carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur |
5 elements present in living organisms as dissolved salts | sodium, magnesium, chlorine, potassium, calcium |
trace elements | only needed by organisms in very small amounts, iron, copper, zinc |
reducing sugar | any sugar that has ability to add electrons to another atom/molecule |
Benedict's reagent | blue->orange/brick red when heated in presence of reducing sugar |
polysaccharides | long chains of monosaccharides (usual glucose) covalently combined (C6 H10 O5)n |
lipids | fats and oils, made from carbon, hydrogen, (oxygen) |
triglycerides | lipids made of 1 glycerol and 3 fatty acids, storing energy, protect organs |
phospholipids | lipids made from 1 glycerol 2 fatty acids, and 1 phosphate molecule, double layer cell membrane, transfer signals into cell |
test for fat | brown paper turns translucent when absorbs fat molecules |
protein | CHON+(sulfur, phosphorus) combine to form amino acids, fibrous globular |
amino acids | chon + sulfur, phosphorus, make up proteins, sequence determines type of protein, bonded by peptide bonds |
fibrous protein | long, straight chains of amino acids, very little folding, stuctural functions collagen, skeletal muscle, keratin |
globular protein | long chains amino acids, lots of folding, metabolic functions, haemoglobin, enzymes, antibodies, hormones |
test for protein (biuret test) | copper sulfate solution and sodium hydroxide will turn purple in presence of peptide bond |
vitamin | needed is small amounts cause cant make it, made in plants, passed along food chain,lack of vitamins causes deficiencys, CHO, but ebery composition different |
fat soluble v | found only in food that contains fat |
water soluble v | found in wide variety of foods |
fat soluble vitamin | vitamin A (retinol), night blindness, formation of rhodopsin (pigment in eye), cod liver oil, butter, margerine |
water soluble vitamin | vitamin c (ascorbic acid), scurvy, formation of collagen, citrus fruits |
dietary minerals | metallic elements required on daily basis |
plants dietary minerals | calcium - formation of middle lamella ( cement that holds plant cell walls together) magnesium - formation of chlorophyll (green pigment) |
animal dietary minerals | calcium - formation of bones and teeth iron - formation of haemoglobin |
water | medium in which metabolism occurs, excellent solvent, hydrolysis reactions, condensation reactions, transporting stuff around cells, high SHC |
hydrolysis reaction | occurs in digestion, water, with enzymes, breaks bonds between carbohydrates, proteins, lipids, water used up, monomers formed |
condensation reaction (polymerisation) | occurs when carbohydrates, lipids, proteins are reassembled in cells, water lost, polymers being made |
anabolism | building large molecs from small ones using energy ex. photosynthesis, protein synthesis |
catabolism | breaking large molecs into small using energy ex. respiration, digestion |