Which one of the following statements is not true?

Select the correct option. Column I - Column II

Column \(I\)	Column \(II\)
(A) Synapsis aligns homologous chromosomes	(i) Anaphase \(II\)
(B) Synthesis of \(RNA\) and protein	(ii) Zygotene
(C) Action of enzyme recombinase	(iii) \(G_2\) ­phase
(D) Centromeres do not separate but chromatids move towards opposite poles	(iv) Anaphase \(I\)
	(v) Pachytene

Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Placentation, In which ovules develop on the inner wall of the ovary or in peripheral part, is

Receptors for sperm binding in mammals are present on :

Match List \(- I\) with List \(- II.\)

List \(- I\)	List \(- II\)
(a) \(S\) phase	(i) Proteins are synthesized
(b) \(G_2\) phase	(ii) Inactive phase
(c) Quiescent stage	(iii) Interval between mitosis and initiation of \(DNA\) replication
(d) \(\mathrm{G}_{1}\) phase	(iv) \(DNA\) replication

Choose the correct answer from the options given below.\((a) -(b) -(c)- (d)\)

Given below are two statements :

Statement I : In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable.

Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, resist changes by evolving repairing mechanism.

In the light of the above statements, choose the most appropriate answer from the options given below :

Identify the incorrect pair.

The order of stability of the following tautomeric compounds is \(\mathop {\begin{array}{*{20}{c}}
  {OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {C{H_2} = C - C{H_2} - C - C{H_3}} 
\end{array}}\limits_{(I)}  \rightleftharpoons \) \(\mathop {\begin{array}{*{20}{c}}
  {OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {C{H_3} - C - C{H_2} - C - C{H_3}} 
\end{array}}\limits_{(II)}  \rightleftharpoons \) \(\mathop {\begin{array}{*{20}{c}}
  {OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {C{H_3} - C = CH - C - C{H_3}} 
\end{array}}\limits_{(III)} \)

Which of the following contraceptive methods do involve a role of hormone?

A chemical signal that has both endocrine and neural roles is

Two rods \(A\) and \(B\) of different materials are welded together as shown in  figure.Their thermal conductivities are \(K_1\) and \(K_2\)  The thermal conductivity of the composite rod will be

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system