Write down the change in the structure of nucleus based on dehydration of nucleus and water re-absorbation in mitotic cell division.

Write down the relation between radius of nucleus and mass number .

Mention the role of nucleus, centrosome and mitochondria in cell division.

Describe the structure of the nucleus of eukaryotic cell with labelled diagram.

Write down the relation between radius of the nucleus and mass number of an atom. What is isotone? Give an example.

Discuss the function of nucleus, in cell division.

Write three features of the metaphase stage and two features of the anaphase stage of mitotic cell division in animal cell.

Write down the morphological changes of cell in prophase stage of mitosis cell division.

(i) 1 mol of an ideal gas expands isothermally and reversible from (P_(1)V_(1)T) to (P_(2)V_(2)T) . Write down the equation showinig the amount of heat absorbed by the given ideal gas. (ii) In an isothermal expansion of an ideal gas, the pressure of the gas decreases from P_(1) to P_(2) . write down the equation of work done by the gas in this process. (iii) The temperature of 1 mol of an ideal gas is increased from T_(1) and T_(2) . write down the equations for the changes in enthalpy and internal energy.

Study the following carefully and explain why mutation (A) did not cause any sickle cell anemia in spite of change in the molecular structure of the gene which codes for Haemoglobin, when as a similar mutation (B) did. (The question is based on properties of the genetic code. c= codon, a = amino acid, Hb = Haemoglobin) Codons for Hb: C_1 - C_2 -C_3 -C_4 - C_5 -G AA -GAA- C_8 ... Amino acids in Hb : a_1-a_2-a_3-a_4-a_5 - Glutamic acid- Glutamic acid - a_8 ...... (Normal Haemoglobin ) Mutation (A) : C_1 -C_2 - C_3 -C_4 -C_5-GAG-"GAA"-C_8...... a_1-a_2 - a_3-a_4-a_5 -Glutamic acid -Glutamic acid - a_8 .... (Normal Haemoglobin ) Mutation (B) : C_1 -C_2 - C_3 -C_4 -C_5-GAG-"GAA"-C_8...... a_1-a_2 - a_3-a_4-a_5 -Valine-Glutamic acid - a_8 .... (Sickle cell Haemoglobin )

Write down the relation between the emf of a galvanic cell and the Gibbs energy change for the chemical reaction occuring in the cell.