69. The two electron micrographs in the figure below show nuclei of two differen

Question

69. The two electron micrographs in the figure below show nuclei of two different cell types. Can you tell from these pictures which of the two cells is transcribing more of its genes? Explain how you arrived at your answer 70. The chromosomes in eukaryotic cells are which contrbute to the chromosomal highly condensed nature. The following statement is incorrect composed by structures calied nucleosomes (beads on a a) Besides histones, other proteins are present in the chromosomes fi.e., scaffold proteins proteins, single-stranded DNA-binding proteins, etc.) b) Analysis of primary structure of histone proteins reveals a high proportion of basic amino acyl residues (e g. arginine and lysine) c) Histones can be chemically d) In somatic cells, eukaryotic e) Histone proteins in nucleosomes are octameric cores (42A/12B/H3114 and a single H1 chromosomes are composed of two or more circular DNA molecules devoid of proteins

Explanation / Answer

69. In the upper picture the chromatin fibers are presenct in condensed form, whereas the lower picture represents more loosely oriteunts chromatin fibers. Now, when a cell is transcriptionally active the chromatin fibers get changed to loose form from its condensed structure so that the regulatory regions of the gene becomes avaolable. Thus the nucleus of the lower picture showing a cell which is transcriptionally more active.

70. d) In somatic cell, eukaryotic chromosomes are composed of two or more circular DNA molecules devoid of proteins.

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