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Categories:
All
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carbohydrates
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glucose
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photosynthesis
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proteins
by
yoshe watson
16 years ago
431
YOSHE-Biology - Animal Survival-the need for food
Animals and plants have essential needs for survival, particularly the necessity for food, which provides energy and raw materials for growth. Carbohydrates, fats, and proteins are the main chemical components of food.
Open
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Biology - Animal Survival(the need for food)
chemical structure of food types
proteins
basic units they are built from-amino acids
elements present-carbon, oxygen, hydrogen, nitrogen
fats
basic units they are built from-fatty acids and glycerol
carbohydrates
basic units they are built from-glucose molecules
elements present-carbon, oxygen, hydrogen
chemical tests
for starch
2/ solution will turn blue/black if starch is present
1/ add 2 drops of brown iodine solution to food solution
for glucose
3/ if glucose is present, an orange precipitate will form
2/ heat in a water bath until it boils
1/ add a few drops of blue benedicts solution to food solution
main chemicals in foods
fats-store energy, insulation, make cell membranes
proteins-growth and repair
carbohydrates eg sugar and starch-provide energy
how organisms obtain their food
animals-eat plants or other animals
plants-make their own food by photosynthesis
why we need food-a source of raw materials for growth and as a source of energy.