Food and nutrition

Question 1

the general formula Cx(H20)y represents the basic unit of which type of biomolecule

Answer 1

Carbohydrates

Question 2

What name is given to molecules that are made up of fatty acids and glycerol

Answer 2

Lipids

Question 3

name of component of food classified on the basis of solubility

Answer 3

Vitamins

Question 4

State the approximate percentage of water,by mass, in a human cell

Answer 4

70%-95% (acceptable range)

Question 4

what property of water is responsible for the efficiency of both sweating and transpiration as a method of temperature regulation

Answer 4

high specific heat capacity or good absorber of energy

Question 4

name the three chemical elements that are presenting all carbohydrates

Answer 4

carbon, hydrogen, oxygen

Question 4

give the general formula for carbohydrates

Answer 4

Cx(H20)y

Question 4

name the smallest unit of a carbohydrates

Answer 4

monosaccharide

Question 4

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

Answer 4

polysaccharide

Question 4

give one structure role of carbohydrates in living organisms

Answer 4

cell wall

Question 4

state one dietary source of carbohydrates

Answer 4

bread

Question 4

name the three elements that are present in all fats(lipids)

Answer 4

carbon, hydrogen and oxygen

Question 5

given difference between fats and oils at room temperature

Answer 5

fats are solid and oils are liquid at room temperature

Question 5

a triglyceride is composed of three molecules of fatty acids attached to another molecule
name this other molecule

Answer 5

glycerol

Question 5

name a test that can be used to demonstrate the presence of fat(lipid) in a food sample

Answer 5

brown paper test

Question 5

what is another name for fats

Answer 5

lipids

Question 5

given metabolic function of fats (lipids) in living organisms

Answer 5

energy store

Question 5

give one structural function of fats (lipids) in living organisms

Answer 5

from cell membrane

Question 5

name the four elements found in all proteins

Answer 5

carbon, hydrogen, oxygen and nitrogen

Question 5

name an element that is only found in proteins

Answer 5

phosphorus or sulfur

Question 5

how many common amino acids are found in proteins

Answer 5

20

Question 5

name one fibourus protein

Answer 5

keratin or collagen

Question 6

name one metabolic role of proteins

Answer 6

enzymes

Question 6

give one good source of protein in the diet

Answer 6

meat

Question 6

triglycerides and phospholipids are types of...

Answer 6

lipids

Question 6

identity one difference between a triglyceride and a phospholipid

Answer 6

triglyceride has three fatty acids and phospholipids has two fatty acids or triglyceride has no phosphate and phospholipids has a phosphate

Question 6

identify one metabolic role for lipids in cells

Answer 6

energy source and storage

Question 6

name one disorder associated with a deficiency of the vitamin D

Answer 6

rickets or osteomalacia

Question 6

name one fat soluble vitamin

Answer 6

vitamin D

Question 6

name one element present in dissolved salts

Answer 6

sodium

Question 6

give one example of a trace element in the human diet

Answer 6

iron , zinc or copper

Question 7

name the basic unit that makes up all lipids

Answer 7

3 fatty acids joined to glycerol or triglyceride

Question 8

respiration is an example of

Answer 8

catabolic

Question 9

what is polysaccharide

Answer 9

many sugar units

Question 10

what is a monosaccharide

Answer 10

one sugar unit

Question 11

name one storage polysaccharide in animals

Answer 11

glycogen

Question 12

name two main reasons why food is nessassary in all living organisms

Answer 12

energy source and respiration

Question 13

what is the ratio of hydrogen atoms to oxygen atoms in a carbohydrate

Answer 13

2:1

Question 14

structural role of lipids in cells

Answer 14

membranes

Question 15

name the main structural polysaccharide in plants

Answer 15

cellulose

Question 16

name of test or chemicals used to demonstrate the presence of protein

Answer 16

copper sulfate

Question 17

name the 4 biomolecules

Answer 17

carbohydrates, fats, proteins, vitamins

Question 18

test for starch + glucose/reducing sugar

Answer 18

iodine- brown to blue benedicts solution - blue to brick red

Question 19

what is the smalled form of a protein

Answer 19

amino acid

Question 20

how many different types of amino acids are there

Answer 20

20

Question 21

what bonds different amino acids together

Answer 21

peptide bonds

Question 22

structural role of protein

Answer 22

keratin

Question 23

test for protein

Answer 23

biuret solution turns from blue to purple/violet… no heat required

Question 24

what chemicals make up biuret solution

Answer 24

sodium hydroxide and copper sulphate

Question 25

why is water needed in the body

Answer 25

good solvent, participates in chemical reactions, carries substances around the body (transport), good absorber of heat energy