2010-2011 F6 Biology Quiz 1 Answers
1
B
The number of carbon atoms of a carbohydrate is not necessarily equal to that of oxygen atoms.
2
A
The cell wall of a plant cell is made up of cellulose. Cellulose is a carbohydrate.
3
D
Starch is the most common food reserve in plants though some monocotyledonous plants store
sugars.
4
A
Starch is made up of a long chain of glucose molecules.
5
A
Lipids are insoluble in water but are soluble in organic solvents. Some lipids are solid.
6
C
Three fatty acid molecules combine with a glycerol molecule to form a triglyceride molecule.
7
B
Lipids leave a translucent spot on a piece of filter paper.
8
D
All of them are the uses of lipids.
9
A
The basic unit of proteins is amino acids.
10
C
A protein molecule contains the following elements: carbon, hydrogen, oxygen, nitrogen and
sulphur.
Short Questions
1
2
(a)
B
[1 A]
(b)
C
[1 A]
(c)
A
[1 A]
(d)
E
[1 A]
(e)
D
[1 A]
carbohydrates
[1 A]
3
molecule A – fructose
[1 A]
molecule B – sucrose
[1 A]
molecule X – water
[1 A]
(b)
C12H22O11
[1 A]
(c)
Since B is a non-reducing sugar, a negative result will be obtained in the Benedict’s test.[1 A]
(a)
The Benedict’s solution remains blue in colour.
(d)
[1 A]
A disaccharide can be broken down into two monosaccharides with specific digestive enzymes
in the body.
[1 A]
It can also be done by heating a solution of disaccharide with a dilute acid in the laboratory.
[1 A]
4
5
6
-
Correct drawing
[2 A]
-
Correct labels (fatty acids, glycerol)
[1 A]
(a)
carboxyl group / -COOH
[1 A]
(b)
sulphur
[1 A]
(c)
polypeptide
[1 A]
(a)
nitrogen
[1 A]
(b)
(i)
molecule Q
[1 A]
(ii)
molecule S
[1 A]
(iii)
molecule R
[1 A]
(iv)
molecule P
[1 A]
(c)
To test for the presence of reducing sugars in a sample.
[1 A]
(d)
Test with Albustix paper.
[1 A]
The paper changes from yellow to green in the presence of protein.
[1 A]