food

Question 1

name the three chemical elements that are present in all carbohydrates

Answer 1

carbon
nitrogen
hydrogen

Question 2

give the general formula for carbohydrates

Answer 2

Cx(H20)y

Question 3

name the smallest unit of a carbohydrates

Answer 3

monosaccharides

Question 4

name the type of carbohydrate formed when many of the smallest units of a carbohydrate bind together

Answer 4

polysaccharide

Question 5

give one structural role of carbohydrates in living organisms

Answer 5

makes up cell wall

Question 6

state one dietary source of carbohydrates

Answer 6

bread

Question 7

give one example of a structural polysaccharides

Answer 7

cellulose

Question 8

identify a non metallic element, other than C,H,O and H, sometimes found in protein

Answer 8

phosphorus

Question 9

name the molecular sub units that combine together to for protein

Answer 9

amino acids

Question 10

name one eater soluble vitamin present in food

Answer 10

vitamin c

Question 11

name one disorder associated with a deficiency of a named vitamin

Answer 11

vitamin c - scurvy

Question 12

how many common amino acids are found in proteins

Answer 12

20

Question 13

name any one fibrous protein

Answer 13

myosin

Question 14

give one metabolic role of proteins in living organisms

Answer 14

enzymes

Question 15

give one good source of protein in the diet

Answer 15

meat

Question 16

identify one difference between fats and oils at room temperature

Answer 16

fats are solid
oils are liquids

Question 17

identify one difference between a triglyceride and a phospholipid

Answer 17

triglycerides have three fatty acids
phospholipids have two fatty acids

Question 18

identify one metabolic role for lipids in cells

Answer 18

energy

Question 19

name one fat soluble vitamin present in food

Answer 19

vitamin d

Question 20

name one disorder associated with a named vitamin(vitamin d)

Answer 20

vitamin d - rickets

Question 21

name one element present in dissolved salts in food

Answer 21

calcium

Question 22

give one example of a trace element in the human diet

Answer 22

copper

Question 23

name the basic unit that makes up lipids

Answer 23

triglyceride

Question 24

respiration is an example of a metabolic pathway in organisms. wha type of ,metabolic pathway is in question

Answer 24

catabolic

Question 25

what is meat by the term polysaccharide

Answer 25

more than two sugar units

Question 26

name a storage polysaccharide found in animals

Answer 26

glycogen

Question 27

state the two reasons why food is required by all living organisms

Answer 27

energy
growth

Question 28

what is the ratio of hydrogen atoms to oxygen atoms in carbohydrates

Answer 28

2:1

Question 29

name a test or give the chemicals used to demonstrate the presence of protein in a food sample

Answer 29

biuret

Question 30

where in the human body would you expect to find the fibrous protein

Answer 30

muscles

Question 31

give a role of a named mineral which is required by plants

Answer 31

magnesium
forms chlorophyll

Question 32

state two reasons why water is required by living organisms

Answer 32

transportation
most things dissolve in water

Question 33

name the metallic element present in haemoglobin

Answer 33

iron

Question 34

which type of biomolecule may be identified by the use of Benedicts solution

Answer 34

reducing sugar

Question 35

where would you expect to find phospholipids in human cells

Answer 35

cell membrane

Question 36

what is the approximate percentage of water in a human cell

Answer 36

70%

Question 37

name a catholic process that produces these simplest units

Answer 37

digestion

Question 38

which carbohydrate is always found in DNA

Answer 38

deoxyribose

Question 39

explain the term metabolism

Answer 39

chemical reactions in an organism