A DNA molecule in which both strands have rad | vedclass

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(D) $DNA$ replication is semiconservative,meaning each original strand serves as a template for a new strand.Initially,we have $1$ $DNA$ molecule with

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There will be two such molecules

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(D) $DNA$ replication is semiconservative,meaning each original strand serves as a template for a new strand.Initially,we have $1$ $DNA$ molecule with $2$ radioactive strands $(R-R)$.After the $1^{st}$ duplication: $2$ molecules are formed,each with $1$ radioactive and $1$ non-radioactive strand ($R-N$ and $R-N$).After the $2^{nd}$ duplication: $4$ molecules are formed. The $2$ radioactive strands from the previous step are distributed into $2$ separate molecules,while the other $2$ molecules consist entirely of non-radioactive strands $(R-N, N-N, N-N, R-N)$.After the $3^{rd}$ duplication: $8$ molecules are formed. The $2$ radioactive strands remain in $2$ separate molecules,while the remaining $6$ molecules are entirely non-radioactive.Therefore,only $2$ $DNA$ molecules will contain radioactive thymidine.

List-$I$	List-$II$
$a$. Ligase	Joins short segments of $\text{DNA}$ together.
$b$. $\text{DNA}$ polymerase	Cuts $\text{RNA}$ at specific $\text{RNA}$ sequence.
$c$. Helicase	Breaks the hydrogen bonds between complementary pairs during $\text{DNA}$ replication.

$A$ $DNA$ molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of $DNA$ molecules that contain some radioactive thymidine after three duplications?

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