Biomolecules · JEE Main previous year questions

2005 2 questions

1. Q1592005 · 28 Apr 2005 · Shift 1

   Consider the reaction: ${\mathrm{N}}_2+3{\mathrm{H}}_2\to 2N{\mathrm{H}}_3$ carried out at constant temperature and pressure. If $\Delta H$ and $\Delta U$ are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?

   1. A.$\Delta H>\Delta U$
   2. B.$\Delta H<\Delta U$
   3. C.$\Delta H=\Delta U$
   4. D.$\Delta H=0$
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   Answer: B

2. Q2012005 · 28 Apr 2005 · Shift 1

   In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-

   1. A.$C_5^{\prime }$ and $C_2^{\prime }$ respectively of the sugar molecule
   2. B.$C_2^{\prime }$ and $C_5^{\prime }$ respectively of the sugar molecule
   3. C.$C_1^{\prime }$ and $C_5^{\prime }$ respectively of the sugar molecule
   4. D.$C_5^{\prime }$ and $C_1^{\prime }$ respectively of the sugar molecule
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   Answer: C