bio molecules (fav)

Question 1

what is glucose chemical formula

Answer 1

c6h12o6

Question 2

what are sugars with a single carbon ring known as

Answer 2

Monosaccharides

Question 3

what are sugars with 2 carbon rings known as

Answer 3

Disaccharides

Question 4

what are many glucose molecules joined together known as

Answer 4

polysaccharide

Question 5

what is an example of a polysaccharide

Answer 5

glycogen

Question 6

what are fats smaller unit

Answer 6

fatty acids and glycerol

Question 7

what are proteins smaller unit

Answer 7

amino acids

Question 8

what is another form of a protien

Answer 8

enzymes

Question 9

what elements are proteins made from

Answer 9

carbon, hydrogen, oxygen, nitrogen

Question 10

what is the test for starch

Answer 10

iodine test

Question 11

what does a positive iodine test show

Answer 11

Dark blue colour (if starch present)

Question 12

what is the test for reducing sugar (monosaccharides)

Answer 12

benedicts solution

Question 13

what does a positive benedicts test show

Answer 13

The solution will change from clear blue to cloudy green, then yellow and finally to a red precipitate
(if monosaccharide is present)

Question 14

what is the test for protiens

Answer 14

biuret test

Question 15

what does a positive biuret test show

Answer 15

A purple colour indicates protein

Question 16

what is the test for fats

Answer 16

ethanol test

Question 17

what does a positive ethanol test show

Answer 17

A milky white emulsion will form.

if fat or oil was present

Question 18

what is the process for a benedicts test

Answer 18

1 ml of sample is placed into a clean test tube.
2 ml (10 drops) of Benedict's reagent is placed in the test tube.
The solution is then heated in a boiling water bath for 3-5 minutes.
Observe for color change (clear blue to brick red) in the solution of test tubes or precipitate formation.

Question 19

test for vitamin C

Answer 19

DCPIP test (Dichlorophenolindophenol)

Question 20

what does a positive test for vitamin C show

Answer 20

blue to colourless

if contains vitamin C

Question 21

what binds with what in DNA

Answer 21

Adenine–thymine (double bond)

cytosine—guanine (triple bond)

Question 22

important specifications of food test

Answer 22

use pestle and mortar to grind what you want to test
this is done to increase surface area so that the colour change is visible

add 5-10ml of iodine to the thing you want to test and observe for colour change from orange-brown to blue-black