1
Q
Describe bacteria’s use in industry
A
- Replicated in a fermenter - division is rapid
- Cells produced is exponential
- They are sources of enzymes
2
Q
Differences between DNA in a chloroplast and DNA in the nucleus
A
- C DNA is shorter , N DNA is longer
- N DNA is associated with histones, C DNA isn’t
- C DNA doesn’t have introns, D DNA does
- N DNA is linear, C DNA is circular
3
Q
Describe the role of antibodies in producing a positive result in the ELISA test.
A
- primary antibodies binds to antigens
- Secondary antibody with enzyme attached binds to primary antigen
- substrate solution is added
- solution changes colour = antigen present
4
Q
Describe how a phagocyte destroys pathogen present in the blood
A
- detects antigen
- engulfs pathogen
- phagosome fuses with vesicle which releases hydrolytic enzymes
5
Q
explain the arrangement of phospholipids in the cell surfaces membrane
A
-bilayer
-hydrophilic head faces water (attracts)
-hydrophobic tail faces away/ repels water
6
Q
Delete
A
