Describe the role of CaCl2 in preparation of competent cells?

Physical change as CaCl2 is a hygroscopic substance which absorbs H2O without actually reacting with it.

(a) Companion cells

(i) Al2(SO4)3→ Aluminium sulphate  (ii) CaCl2→ Calcium chloride  (iii) K2SO4→ Potassium sulphate  (iv) CaCO3→ Calcium carbonate

CaCl2 is known to increase the efficiency of DNA uptake to produce transformed bacterial cells. The divalent Ca+2 ions supposedly create transient pores on the bacterial cell wall by which...

Two Ag+ ions will be replaced by one Ca2+ ion to maintain electrical neutrality. Thus, a hole is created at the lattice site for every Ca2+ ion introduced.

The chemical bonds formed between two atoms by the sharing; of electrons between them is known as a covalent bond. The sharing of electrons between the two atoms takes place...

(a) Since DNA is hydrophillic , it cannot pass through cell membrane hence bacterial cells are made competent  by treatment with a specific concentration of a divalent cation,such as Ca++ which...

(i) Pig iron is melt with scrap iron and coke using hot air blast. Due to this, impurities such as C, S and P present in the pig iron are...

b. Transformed cells