Get latest CBSE Class 12 Biotechnology Sample Paper 2019-2020 with Marking Scheme. From the following table students may download CBSE Class 12 Biotechnology Marking Scheme also. All of these previous year CBSE Class XII Biotechnology Sample Paper are provided by Central Board of Secondary Education India.
CBSE Class XII Biotechnology Sample Paper 2019-20
1. Advantages of Pichia pastoris as a eukaryotic expression host:
(i) Has strong inducible promoters
(ii) Is capable of making post-translational modifications
(iii) Downstream processing is simpler as Pichia does not secrete its own proteins into the fermentation medium.
(Any two of the above advantages) 1+1
2. Biosynthetic pathway which leads to the production of secondary metabolites are being engineered for their over-production to reduce the cost. 1
The over expression of the gene which encodes for the first enzyme in the pathway which results in higher levels of desired end products. 1
3. Advantages of animal cell culture:
Homogenous genetic population, Controlled physico-chemical environment, Easy to add genes, Available in adequate numbers, Easy production, No ethical clearance required, Cost effective.
(any two of the above points)
Disadvantages of animal cell culture:
small size sensitive to detect the changes, challenging scale up, may not represent in vivo phenotype and genotype. (any two of the above points)
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