CBSE Class 12 Biotechnology Board Question Paper 2017 (Outside Delhi Set-1)
This is the CBSE Class 12 Biotechnology Previous Year Question Paper for the 2017 examination, specifically the Outside Delhi Set-1. The paper consists of compulsory questions with internal choices provided in one 3-mark and one 5-mark question. It is structured into very short answer questions (1 mark each), short answer questions (2 marks and 3 marks each), and long answer questions (5 marks each). The duration and total marks are not explicitly stated in this section, but the question breakdown indicates a comprehensive assessment of Biotechnology concepts. Solving this board question paper helps students understand the exam pattern, question types, and marking scheme, crucial for effective preparation and scoring well in the CBSE board exams.
Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Biotechnology |
| Session | 2017 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The paper includes very short answer questions (1 mark), short answer questions (2 and 3 marks), and long answer questions (5 marks), with internal choices in some questions.
Topics covered
Paper topics
- Proteome dynamism
- Lyophilization
- Animal cell culture
- Osmolality maintenance
- DNA synthesis direction
- Human cell line establishment
- Vector choice in rDNA technology
- r-HUEPO vs. blood transfusion
- Bacteriophage defense in bacteria
- Type-II restriction enzymes
- Synthetic seeds
- Nutraceutical proteins
- Computational vs. experimental gene identification
Important topics
- rDNA technology
- Animal cell culture
- Gene identification
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Question paper text
Question Paper Outside Delhi 2017 set 1 CBSE Class 12 Bio – Technology
General Instructions:
All questions are compulsory.
There is no overall choice. However, an internal choice has been provided in one question of 3 marks and one question of 5 marks. You have to attempt only one of the choices in such questions.
Questions No. 1 to 6 are very short answer questions, carrying 1 mark each.
Questions No. 7 to 14 are short answer questions, carrying 2 marks each.
Questions No. 15 to 25 are also short answer questions, carrying 3 marks each.
Questions No. 26 to 28 are long answer questions, carrying 5 marks each.
lacktrian Use of calculators is not permitted. However, you may use log tables, if necessary.
1. Proteome of a given cell is dynamic. Why?
Ans. Proteome of a given cell is dynamic because in response to internal & external changes the biochemical machinery of the cell could be changed.
2. What is lyophilization?
Ans. Freezing of a culture followed by drying under vacuum.
- Why is a pan of water always kept in an incubator chamber, used for animal cell culture?
Ans. Osmolality within a cell is 300 m and therefore has to be maintained for- high humidity, preventing desiccation of culture medium, maintenance of correct osmolarity (Any one).
- While growing animal cells in a laboratory, osmolality of medium is always maintained around 300 m Osm. Why?
Ans. Cells will otherwise shrink or swell, cell growth/function will be affected.
- Why is a DNA sequence always listed in the direction 5' to 3'?
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Ans. DNA is biologically synthesized in the 5'- 3' direction.
- Name the scientist who established the first human cell line from cervix cancer cells. Ans. George Gay.
- Choice of vector is crucial for a r-DNA experiment. Give two reasons for the same. Ans. (i) Depending on insert size.
- Nature of the host.
- Why is r-HUEPO preferred over blood transfusion in a person with blood loss due to accident?
Ans. No donor is required for transfusion, no transfusion facilities, no risk of transfusion related infection (any two).
- (a) How do bacteria protect themselves from infection by bacteriophages?
- Why are only type-II restriction enzymes used in r-DNA technology?
Ans. (a) Using restriction enzymes; Restriction enzymes will not cut own chromosomal DNA.
- Type II restriction enzymes cut within the recognition sequence.
- Draw a labelled diagram of a synthetic seed.
Ans.
- Curd and whey are categorised as nutraceutical proteins. Why?
Ans. Curd and whey are rich sources of nutrients- essential amino acids etc. and have pharmaceutical compounds which elevate glutathione which detoxify xenobiotics.
- The number of genes predicted by computational biology is different from the
number of genes identified by experimental methods in a genome. Justify.
Ans. (a) existence of overlapping genes and spliced variants.
- incorrect prediction due to use of experimentally identified genes.
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Frequently asked questions
What is this document?
This is the CBSE Class 12 Biotechnology Previous Year Board Question Paper from 2017 (Outside Delhi Set-1) for exam practice.
What is the structure of the Biotechnology 2017 paper?
The paper has compulsory questions divided into very short answer (1 mark), short answer (2 and 3 marks), and long answer (5 marks) categories, with internal choices in some questions.
How does solving this previous year paper help?
Solving this previous year question paper helps students understand the exam pattern, question types, and marking scheme, improving their preparation and potential scores.
What are the key topics covered in this paper?
Key topics include proteome dynamism, animal cell culture, rDNA technology, restriction enzymes, synthetic seeds, and gene identification methods.
Is there any choice available in the questions?
Yes, an internal choice is provided in one question of 3 marks and one question of 5 marks.
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