Question

Match the columns and choose the correct combination.

$a$	Sulphur	$1$	Chlorophyll
$b$	Zinc	$2$	Nitrogenase
$c$	Magnesium	$3$	Methionine
$d$	Molybdenum	$4$	Auxin

• A. $a-1,b-2,c-3,d-4$
• B. $a-3,b-4,c-1,d-2$
• C. $a-3,b-1,c-2,d-4$
• D. $a-2,b-4,c-1,d-3$

Answer 1

The correct option is B $a-3,b-4,c-1,d-2$

Methionine is an amino acid which contains sulphur. The initiation of the polypeptide chain in prokaryotes is always brought about by the amino acid methionine but it has to be formylated to form formylmethionine (fmet). This methionine binds with tRNA-${}^{fmet}$ to form fmet-tRNA${}^{fmet}$.

Zn influences plant hormone protein.

Magnesium is centrally located in the chlorophyll. It consists of porphyrin ring which has magnesium ion in the center.

Nitrogen fixation is the process of conversion of atmospheric nitrogen into salts of nitrogen which can be easily used by the plants. It takes place in presence of an enzyme known as nitrogenase enzyme. It is produced by certain cyanobacteria and helps in the reduction of nitrogen to ammonia. It is made up of two component dinitrogenase and dinitrogenase reductase. The dinitrogenase contains a cofactor of iron and molybdenum which helps in reduction of nitrogen to ammonia.

So, the correct answer is option B.