1+2-Scientific Method and Food Flashcards
Hypothesis
educated guess based on observations
scientific method
process of investigation in which problems are identified and their suggested explanations are tested bu carrying out experiments
theory
hypothesis supported by many experiments
principle
arises from a theory that has shown to be valid when fully tested over a long period of time
double blind
both investigator and participant are unaware of treatment participant is receiving
ethics
whether a conduct is right or wrong
metabolism
sum of all chemical reactions
continuity of life
way in which living things arise from living things of the same type
functions of food (3)
growth and repair
energy
make chemicals needed for metabolic reactions
biomolecules
chemicals made inside a living thing eg protein,lipids,carbs,vitamins)
glucose chemical formula
c6h12o6
anabolic reaction
use energy to convert smaller molecules into larger molecules e.g. cellulose from glucose
catabolic reactions
release energy when a complex molecule is broken down into simpler form e.g. respiration
6 common elements
carbon oxygen hydrogen nitrogen sulphur phosphorus
5 dissolved salts
magnesium sodium chlorine potassium calcium
3 trace elements
iron
copper
zinc
monosaccharides
single sugar units soluble sweet e.g. glucose gives energy found in fruit sweets etc
disaccharides
sweet
soluble
2 monosaccharides joined together
e.g. maltose=glucose+glucose
polysaccharides
insoluble
unsweet
many monosaccharides joined together
e.g. starch
structural role of carbs
form plant cell walls
metabolic role of carbs
energy store in all plants (starch)
broken down in respiration to release energy (glucose)
peptide
polypeptide
protein
peptide less than 20
polypeptide less than 200
protein more than 200
fobrous protein
little folding
long fibres
strong
e.g. keratin in nails
globular protein
lots folding
rounded shapes
e.g. enzymes
