Inner Transition Metals & Bio-inorganic - Chemistry MCQ

Species having large number of unpaired electron can be used in MRI. As Gd has seven unpaired electron. Hence, used in MRI.

Carboxypeptidase is responsible for cleavage of peptide bond as it has Zn²⁺ ion at active centre

Cytochrome b is not involve in electron transfer in photosynthesis

Tarnsferrin is involved in transport of iron and have Fe in +3 oxidation state

Haemocyanin, do not contain Fe and porphyrin. Hence, it is a non-heme protein.

Transferrin and ferrtin are responsible for Fe transport and storage respectively.

 there is 4f-5d transition. It absorbs in UV. Therefore, it is colourless

(1) The magnetic moment of Ln³⁺ ions depends on the spin-orbit coupling, not on the number of unpaired electrons.
(2) La³, Ce³⁺, Gd³⁺, Yb³⁺ and Lu³⁺ colourless
(3) Since, the 4f-orbitals buried deep inside the atom, there is no or little interaction between Ln3+ ions and the ligands. Therefore, zero value does not depend on the nature of ligand.
(4) For the same reason discussed in point 3, most of the Ln³⁺ ions show sharp peaks.

In Eu and Yb metals, which have the stable electronic configuration 4f⁷ 6s² and 4f¹⁴ 6s². Only two electrons contribute in the M-M bonding resulting in the +2 oxidation state. In the other lanthanoids, three or more electrons participate in M-M bonding resulting in the +3 oxidation state of metal.

Hemoglobin and hemerythrin contain iron and both are responsible for oxygen transport.

Cytochrome c contains a heme iron metal center that is essential to its function. During the electron transport process, this heme iron interconverts between the Fe3+ and Fe2+ oxidation states, which allows for electrons to be accepted and donated.

In this complex ion, NO^-₃ acts as bidentate ligand. Therefore, coordination number of Ce is 10.

It contain Fe and Cu