Chapter 6 Part 2: Molecular Basis of Inheritance

<div style='text-align : center'>
<Success><font size="5"><b>Molecular Basis of Inheritance</b></font></Success>
</div>
<h4 id="primarymultiple-choice-questions-mcqsprimary-33"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
<hr>
<div class="text-container">
<p><strong>Sol.</strong> Meselson and Stahl found that DNA of the first generation was hybrid or intermediate $\left({ }^{15} \mathrm{~N}\right.$ and $\left.{ }^{14} \mathrm{~N}\right)$.</p>
<ul>
<li>It settled in caesium chloride at a level higher than the fully labelled DNA of parent bacteria $\left({ }^{15} \mathrm{~N}^{15} \mathrm{~N}\right)$.</li>
<li>The second generation of bacteria after 40 minutes, contained two types of DNA, $50    \%$ light $\left(\mathrm{N}^{14} \mathrm{~N}^{14}\right)$ and $50    \%$ intermediate $\left(\mathrm{N}^{15} \mathrm{~N}^{14}\right)$.</li>
</ul>
<p><Success>Sol. to be continued</Success></p>
</font>
</div>
<hr>
<font size ="4">
<div style='text-align : center'>
<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
</div>
</font>

<div style='text-align : center'>
<Success><font size="5"><b>Molecular Basis of Inheritance</b></font></Success>
</div>
<h4 id="primarymultiple-choice-questions-mcqsprimary-34"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
<hr>
<div class="text-container">
<ul>
<li>The third generation of bacteria after 60 minutes contained two types of DNA, $25    \%$ intermediate $\left(\mathrm{N}^{15} \mathrm{~N}^{14}\right)$ and $75    \%$ light $\left(\mathrm{N}^{14} \mathrm{~N}^{14}\right)$ in 1:3 ratio.</li>
<li>The fourth generation after 80 minutes contained $12.5    \% \mathrm{~N}^{15} \mathrm{~N}^{14}$ and $87.5    \% \mathrm{~N}^{14} \mathrm{~N}^{14}$ DNA in $1: 7$ ratio.</li>
</ul>
<p><Success>Sol. to be continued</Success></p>
</font>
</div>
<hr>
<font size ="4">
<div style='text-align : center'>
<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
</div>
</font>

<div style='text-align : center'>
<Success><font size="5"><b>Molecular Basis of Inheritance</b></font></Success>
</div>
<h4 id="primarymultiple-choice-questions-mcqsprimary-36"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
<hr>
<div class="text-container">
<font size ="6">
<p><strong>Ques.</strong> If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is $
5^{\prime}-\text { A T G A A T G - 3’, }$ the sequence of bases in its RNA transcript would be</p>
<p class="fragment">(a) $5^{\prime}$ - A U G A A U G - 3' <br>
(b) $5^{\prime}-\cup A C \cup \cup A C-3^{\prime}$ <br>
(c) $5^{\prime}$ - $\mathrm{C}$ A $\cup \cup \mathrm{CA} \cup-3^{\prime}$ <br>
(d) $5^{\prime}-\mathrm{G} \cup \mathrm{A} A \mathrm{G} \cup \mathrm{A}-3^{\prime}$ </p>
</font>
</div>
<hr>
<font size ="4">
<div style='text-align : center'>
<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
</div>
</font>

<div style='text-align : center'>
<Success><font size="5"><b>Molecular Basis of Inheritance</b></font></Success>
</div>
<h4 id="primarymultiple-choice-questions-mcqsprimary-42"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
<hr>
<div class="text-container">
<p><strong>Sol.</strong> In $E$. coli bacterium, the RNA polymerase has co-factors $\beta, \beta^{\prime}, \alpha, \alpha^{\prime}$ and $\omega$ along with $\sigma$ (sigma) factor, to catalyse the process.</p>
<ul>
<li>The transcription is completed in three steps.</li>
<li>Initiation $\sigma$ (sigma) factor recognises the start signal and promotor region on DNA which then along with RNA polymerase binds to the promoter to initiate transcription.</li>
</ul>
<p><Success>Sol. to be continued</Success></p>
</font>
</div>
<hr>
<font size ="4">
<div style='text-align : center'>
<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
</div>
</font>