practical bio-chem 1 : qualitative tests for biological molecules Flashcards
1
Q
what does the qualitative test rely on ?
A
- the biological molecules in the sample passing into solution
2
Q
what are each of these tests used to determine ?
A
- the presence or absence of the particular biological molecule
3
Q
what must you where when carrying out this practical ?
A
eye protection
4
Q
what solution do you add if your testing for starch ?
A
iodine solution
5
Q
what colour change would occur if starch is present ?
A
yellow-brown to blue-black
6
Q
what causes the colour change within starch when present ?
A
7
Q
what is starch ?
A
a carbohydrate
8
Q
what do reducing sugars contain ?
A
- all monosaccharides and some disaccharide
9
Q
why are they known as reducing sugars ?
A
as they can reduce or give electrons to other molecules
10
Q
what solution is used to test reducing sugars ?
A
- benedict’s solution
11
Q
what colour change occurs when heating a reducing sugar with benedict’s solution ?
A
12
Q
what does
A
