Q4 of 27 Page 1

Name the technique by which Gene expression can be controlled with the help of an RNA molecule.

RNA interference is the technique by which gene expression can be controlled.

EXAMPLE: Introduction of DNA using vectors to the host plant. This involves the production of sense and anti-sense RNA which together form double-stranded RNA. Thereby initiating RNAi and silencing the mRNA of the host. RNAi takes place in all eukaryotes as a method of cellular defence.


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2

Give the scientific name of the source organism from which the first antibiotic was produced.

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The prophase I stage of meiosis plays a vital role in r-DNA formation. Justify with reason.

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Define Diapause

OR


Standing Crop

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The figure given below represents a molecule present in the body of a mammal –

dna.png


a) Name the parts labelled ‘a’ and ‘b’ in the molecule shown above.


b) Name the type of cells that produce this molecule.


OR


Life style diseases are increasing alarmingly in India. We are also dealing with large scale malnutrition in the population. Suggest a process by which we can address both these problems. Give any three examples to support your answer.