STD 12 - 6. evolution — BIOLOGY STD 12 Science — Question

$I.$ Polymerase Chain Reaction $(PCR)$ is a technique of synthesizing multiple copies of the desired gene in vitro

$II.$ This technique was developed by Kary Mullis in $1985$

$III.$ A single $PCR$ amplification cycle involves three basic steps; denaturation, annealing and extension

Which of the statement given above are correct?

$(A)$ Colostrum is recommended for the new born because it is rich in antibody.

$(B)$ Chikungunya is caused by a Gram negative bacterium.

$(C)$ Tissue culture has proved useful in obtaining virus­free plants.

$(D)$ Beer is manufactured by distillation of fermented grape juice. How many of the above statements are wrong?

$i. r-RNA$ provides the template for synthesis of proteins.

$ii.$$ t-RNA$ brings amino acids and reads the genetic code.

$iii. $$RNA$ polymerase binds to promoter and initiates transcription.

$iv. $A segment of $DNA$ coding for polypeptide is called intron.