Q1 of 42 Page 1

Why is RNA more reactive in comparison to DNA?

RNA is more reactive than DNA, following are the reasons:


- RNA is made up of ribose sugar, while DNA is made of deoxy ribose sugar. Due to present of -OH group in the robes sugar , RNA is more active.


- RNA is single stranded, hence its nitrogenous base is not away from water, and thus is reactive. While in case of DNA , it is noble stranded it has its nitrogenous base in the interior of the both the strands , thus keeping it away from water.


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Explain the application of biotechnology in producing Bt cotton.

OR


Unless the vector and source DNA are cut, fragments separated and joined, the desired recombinant vector molecule cannot be created.


(a) How are the desirable DNA sequences cut ?


(b) Explain the technique used to separate the cut fragments.


(c) How are the resultant fragments joined to the vector DNA molecule ?


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Mention the site of fertilization of a human ovum. List the events that follow in sequence until the implantation of the blastocyst.

OR


(a) Draw a diagram of a fertilized embryo sac of a dicot flower. Label all its cellular components.


(b) Explain the development of a mature embryo from this embryo sac.


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In what way is monocyte a cellular barrier with reference to immunity ?

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Explain with the help of an example the type of evolution homology is based on.