Question

1. The bacterium pneumoniae has a virulent S strain and a nonvinulent R strain. The S contains a chemical factor that can transform the R strain to be of these is lethal to mice. The S strain viruilent. The diagram shows a series of experiments conductod by injecting combinations experiments result in a dead mouse mice to identify the transforming factor. If DNA is the transforming factor S strain (virulet) R strain and hean-treared S strain a. None of the experiments b. All except A c. Only B d. B, D, E e. B. D, F 2. Complete the sentence. Histone proteins a Attach to DNA and form compacted DNA-protein associations b. Release bound DNA to enable nuclear division during mitosis c. Organize DNA into separate chromosomes at the beginning of mitosis. d. Enable mitochondrial DNA to replicate with nuclear DNA before mitosis. 3. The pre-mRNA shown below undergoes alternative splicing, Arrows indicate the altemative 3 splice sites and the black region in exon B encodes a premature stop codon and which protein is longer? codon. Which mRNA is longer a. mRNA 1 is longer and protein 1 is longer b. mRNA 1 is longer and protein 2 is longer c. mRNA 1 is longer and both proteins are same size d. mRNA 2 is longer and protein 1 is longer c. mRNA 2 is longer and protein 2 is longer Alternative 3'splice sites pre-mRNA S Intron. Intron

Answer 1

Answer 2 :  In the nucleus of eukaryotic cells there are alkaline proteins named as Histone proteins considered as major components of chromatin an d play major role during gene regulation. These histone proteins are rich in amino acids and are positively charged. They organized as octomer and wrapped themselves around DNA (negatively charged due to phosphates).

So option “A” Attached to DNA and form compacted DNA protein association” is the right answer for the question.