Which one of the following statements are correct?

(i) The chromatin fibres, coiled and condensed at prophase stage of cell division of form chromosome. The packaging of chromatin at higher level requires proteins called non-histone chromosomal (NHC) proteins.

(ii) In nucleus, region of chromatin that are loosely packed and stains light are reffered as euchromatin and chromatin that is densely packed and stains dark are called heterochromatin.

(iii) Eu chromatin s transcriptionally active and hetero chromatin is inactive.

(iv) In Griffith’s experiment, streptococcus pneumonia bacteria was used. S-stain of bacteria produces rough colonies because it has mucous (polysaccharide) coat that was absent in R-stain.

(v) In Griffith’s experiment, mice infected with S strain die from pneumonia infection.

(vi) Hershey and Chase worked together to discover the nature of transforming principle. They grew virus on medium containing radioactive phosphorous and some on medium containing radioactive sulphur.

(vii) In Hershy-Chase experiment, the sequence of stage was infection, blending and centrifugation. At the end radioactive sulphur was detected in supernatant and radioactive phosphorous was detected in cell.

(viii) 1’-OH group present at every nucleotide in RNA is a reactive group and makes RNA liable and easily degradable.

(ix) DNA nucleic acid is preferred for storage of genetic information and RNA nucleic acid for transmission.

(x) RNA nucleic acid was the 1 st genetic material.

(xi) The replication of DNA is conservation as each DNA molecule have one parental and one newly synthesized strand.

(xii) In 1958, Meselson and Stahl had prove that DNA replicates semiconservatively.

(xiii) In Meselson and Stahl’s experiments, the heavy DNA molecule was distinguished from normal DNA by centrifugation in cesium chloride (CsCl) density gradient.

(xiv) The main enzyme for replication of DNA is DNA-dependent RNA polymerase.

Choose the correct option given below: