Week 1
2
3
4
5
6
7
8
Height of plants grown in
sterilised soil (cm)
0,8
1,5
2.0
2,3
2,4
3,8
5,0
6,0
Height of plants grown in
non-sterilised soil (cm)
2,0
5,5
8,7
10,0
12,0
16,2
19.1
25,0
2.4.1
Define mutualism.
(1)
2.4.2
Describe the mutualistic relationship between the fungus and the
plants.
(2)
2.4.3
Identify the:
(1)
(a) Independent variable
(1)
(b) Dependent variable
i l
2.4.4
Describe ONE way in which the scientists ensured that the results
of this investigation are valid.
(1)
2.4.5
Use the data in the table above to draw two line graphs on the
same set of axes.
(6)​

3 is cell membrane, 5 is nucleoid and 6 is plasmid.

Explanation:

Structure 3 is cell membrane, structure 5 is nucleoid and structure 6 is plasmid. The structure 4 is cell wall which function is to protect the bacterial cell from outside environment.  Bacteria develop resistance to antibiotics due to mutation which change its features. The same type and regular use of antibiotics leads to develop resistance in the bacteria. Plasmids can be used in the production of insulin for diabetics because plasmid has the ability to produce many copies of certain genes.