(Download) CBSE Class-12 Sample Paper 2018-19 :Biotechnology
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(Download) CBSE Class-12 Sample Paper 2018-19 : Biotechnology
Class XII
Biotechnology (045)
Time allowed: 3 Hours
Max. Marks: 70
General Instructions:
(i) Question paper contains four sections-A, B, C and D.
(ii) All questions are compulsory
(iii) There is internal choice in all sections. You have to attempt only
one of the choices in such questions.
(iv) Question numbers 1 to 6 are very short answer questions, carrying 1
mark each.
(v) Question numbers 7 to 14 are short answer questions, carrying 2 marks
each.
(vi) Question numbers 15 to 25 are also short answer questions, carrying 3
marks each.
(vi) Question numbers 26 to 28 are long answer questions, carrying 5 marks
each.
(vii) Use of calculators is not permitted. However, you may use log
tables, if necessary.
SECTION-A
1. 4 copies of ds DNA are subjected to polymerase chain reaction. How many copies would be obtained after 20 cycles?
OR
1.How can we use LEU 2 gene as a selectable marker?
2. Specify the role of alkaline phosphatase in cloning.
3. Specific activity increases during subsequent steps of a protein purification scheme. How can you relate it with the purity of protein?
4. Animal cells in a culture medium were placed in a regular incubator used for growing bacterial cells. Do you expect the animal cells to grow or not?
5. What is Gene Knock out?
6. What will be the consequence if a protein is having an altered structure?
OR
6.Expand and define PER?
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