CIE Biology Paper-4: Specimen Questions 77 - 80 of 120
Question number: 77
Describe in Detail
If, a person is suffering from DNA deficiency. How will he be cured?
Explanation
Person can be cured by the help of gene therapy. In such therapy, ADA gene has taken from the leucocytes of a healthy person and inserted it into a retrovirus than it is injected to the lymphocyte stem cells of patient along with helper virus. Lymphocytes generated by these stem cells had normal ADA gene. Permanent cure can be done when functional ADA gene is introduced in cell of early embryo.
Passage
The figure shows the exchange of two gases between plant and animal.
Find the values in 2 empty boxes
Which gases must come in this diagram
Question number: 78 (1 of 2 Based on Passage) Show Passage
Write in Short
Which processes are done in given figure. Explain them?
Explanation
Photosynthesis process and respiration occur.
Photosynthesis-It is a process, which is used by plants and other organisms to convert light energy into chemical energy.
Respiration- Respiration is a process, which occur inside the living cells of every type of organism. It is the sum total of the physical and chemical processes in an organism by which oxygen is transfer to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.
Question number: 79 (2 of 2 Based on Passage) Show Passage
Write in Short
Identify the values in 2 boxes
Explanation
Oxygen and carbon dioxide are part of these boxes
Which gases must come in this diagram
Question number: 80
Describe in Detail
How aerobic respiration is different from anaerobic respiration
Explanation
In the process of aerobic respiration oxygen is needed and in anaerobic respiration does not use oxygen.
| Aerobic Respiration | Anaerobic Respiration |
| Aerobic respiration occurs in most cells | It occurs mainly in prokaryotes |
| The amount of energy release is high about 36 - 38 ATP molecules | The amount of energy releases is low about 2 ATP molecules |
| Products are Carbon dioxide, water, ATP | Carbon dioxide, reduced species, ATP |
| It does not produce ethanol or lactic acid | It produce ethanol or lactic acid |