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Class 12 CBSE Pre Board 2016 : Biotechnology (Kendriya Vidyalaya (KV) No. 1, Salt Lake)

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Sample Question Paper 2015 - 16 Class XII Biotechnology (045) Time: 3 Hrs. M.M.:70 General Instructions: (i) (ii) All questions are compulsory. There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks. You have to attempt only one of the choices in such questions. (iii) Question paper contains four sections -A, B, C and D. (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 - I, carrying 2 marks each. (vi) Question numbers 15 to 25 are also short answer questions - II, carrying 3 marks each. (vii) Question numbers 26 to 28 are long answer questions, carrying 5 marks each. (viii) Use of calculators is not permitted. However, you may use log tables, if necessary. SECTION-A Q1. A scientist wants to protect a part of a DNA from attack by restriction enzymes. Design first step of his experiment? (1) Q2. Presence of selectable marker is an essential feature of an ideal cloning vehicle. Give reason. (1) Q3. Expand and define PER. Q4. Given below is a list of the first 8 residues of the -helix in myoglobin from different organisms. Based on this information, identify the amino acids which are most (a) conserved (b) variable (1) (1) Population Organism 1 2 3 4 5 6 7 8 Rabbit Dog Sea Anemone Crab Rohu Whale A A K A A A L L I I R F R D D D R E L L L L L L M M H H M T G E C C C G P F H Q Q G E E E E E E

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