CBSE 2025 · Region 5 · Set 1 · Q31 · 5 marks
Define transgenic animals. Explain in detail any four areas where they can be used for human benefit.Describe the structure and working of a sparged stirred-tank bioreactor.
Define transgenic animals. Explain in detail any four areas where they can be used for human benefit.
Describe the structure and working of a sparged stirred-tank bioreactor.
Marking-scheme solution
• Animals that have had their DNA manipulated to possess and express an extra gene
are known as transgenic animals.
• Areas of benefits are
Normal physiology and development, Transgenic animals can be specifically designed
to allow the study of how genes are regulated and how they affect the normal functions of the body and its development like study of complex factors involved in growth such as insulin-like growth factor.
Study of disease, transgenic animals are used to increase understanding of how genes
contribute to the development of disease like cancer or cystic fibrosis
Biological products, transgenic animals that produce useful biological products can be
created and the products can be used to treat diseases like ( -$\displaystyle 1$-antitrypsin) human protein can be produced to treat emphysema / Rosie, produced human protein enriched milk containing alpha – lactalbumin which is a balanced product for human babies or any other examples.
-Vaccine safety, transgenic mice are being developed for use in testing the safety of
vaccines before they are used in humans like transgenic mice are being used to test the safety of the polio vaccine
Chemical safety testing, transgenic animals are modified to carry gene which make them
more sensitive to toxic substances than non-transgenic animals so transgenic animals are exposed to the toxic substances and the effects studied
Vessels or large containers which provide optimal conditions to produce the desired
product.
The stirrer facilitates even mixing, and oxygen availability throughout the bioreactor.
Air is bubbled through the reactor to increase the oxygen transfer area.
It has foam control system, a temperature control system, pH control system, salts,
vitamins, sampling ports so that small volume of culture can be withdrawn periodically.
(Marks to be allotted if the key words are depicted in the diagram in lieu of explanation)
Biotechnology and its ApplicationsTransgenic AnimalsUnderstandlong_answerhard
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.