4.biological molecules

Question 1

carbohydrates

Answer 1

substances, that include sugars, starch and cellulose, that contain carbon, hydrogen and oxygen

Question 2

suagrs

Answer 2

carbs that have relatively small molecules, soluble in water and taste sweet

Question 3

glucose

Answer 3

a sugar that is used in respiration to release energy

Question 4

glycogen

Answer 4

a carb hat is used as an energy store in animal cells

Question 5

starch

Answer 5

a carb that is used as an energy store in plants

Question 6

iodine solution

Answer 6

a solution of iodine in potassium iodide that is orange-brown and turns blue-black when mixed with starch

Question 7

benedict’s solution

Answer 7

a blue liquid that turns orange-red when heated with reducing sugar (turns orange-red)

Question 8

fats and oils

Answer 8

fats are lipids that r solid at room temp, oils r lipids that r liquid at room temp

Question 9

lipids

Answer 9

substances containing carbon, hydrogen and oxygen, that are insoluble in water and are used as energy stores in organisms

Question 10

emulsion

Answer 10

a liquid containing two substances that do not fully mix so one of them forms tiny droplets dispersed throughout the other

Question 11

protein

Answer 11

a substance whose molecules are made of many amino acids linked together

Question 12

amino acids

Answer 12

substances with molecules containing carbon, hydrogen, oxygen and nitrogen

Question 13

biuret reagent

Answer 13

a blue solution that turns purple when mixed with amino acids or proteins

Question 14

DCPIP

Answer 14

a purple liquid that becomes colourless when mixed with vitamin c

Question 15

nucleotides

Answer 15

molecules that are linked together into long chain s to make a dna molecule

Question 16

base

Answer 16

one of the components of dna (4 basesp-A,C,G,T) whose sequence determines the proteins that are made in a cell

Question 17

complementary base pairing

Answer 17

the way in which the bases of two strands of dna pair up (A-T and C-G)