How did an American Company. Eli Lilly use the knowledge of r-DN

Subject

Biology

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

21.

Describe any three potential applications of genetically modified plants.

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22. How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions unfavourable for their survival?
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23. How did an American Company. Eli Lilly use the knowledge of r-DNA technology to produce human insulin?


American Company Eli Lilly used the knowledge of r-DNA technology to produce human insulin in the following way.

1. Preparation of DNA corresponding to A and B chain separately
2. Extraction of plasmid from bacteria
3. Insertion of DNA corresponding to A and B chain separately in plasmid
4. Transforming the bacteria with this recombinant plasmid
5. Expression of the desired product from this DNA .
6. Purification of A and B chain
7. Linking them with disulfide bonds so that they act as human insulin
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24.

With the help of a flow chart, show the phenomenon of biomagnification of DDT in an aquatic food chain.

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25.

Your school has been selected by the Department of Education to organize and host an interschool seminar on 'Reproductive Health – Problems and Practices'. However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is 'too embarrassing.'
Put forth four arguments with appropriate reasons and explanation to justify the topic to be essential and timely.

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 Multiple Choice QuestionsLong Answer Type

26.

(a) Plan an experiment and prepare a flow chart of the steps that you would follow to ensure that the seeds are formed only from the desired sets of pollen grains. Name the type of experiment that you carried out.

(b) Write the importance of such experiments.

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27. Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
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28.

(a) Why are thalassemia and haemophilia categorized as Mendelian disorders ? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.

(b) Write the genotypes of the normal parents producing a haemophilic son.

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29. How do m-RNA, t-RNA and ribosomes help in the process of translation?
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30.

(a) List the different attributes that a population has and not an individual organism.

(b) What is population density ? Explain any three different ways the population density can be measured, with the help of an example each.

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