300
Question
Identify X, Y and Z in the uncoiling of chromosome.
Identify X, Y and Z in the uncoiling of chromosome.
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Solution
The correct option is D X = Chromatin
Y = Histone
Z = Pentose sugar
∙ When the chromosome is uncoiled, the first structure observed is known as chromatin fibre. It resembles a tightly coiled rope.
∙ Chromatinn fibre is made up of coiled ‘beads on a string’ like structure called nucleosomes.
∙ A nucleosome consists of DNA wrapped around an octameric protein known as histone. This kind of wrapping makes packaging of long DNA molecules efficient.
∙ DNA is a double stranded molecule that is made of two long chains of individual molecules known as nucleotides.
∙ The nucleotides are composed of three units, a phosphate group, deoxyribose sugar and one of the 4 nitrogenous bases (adenine, thymine, guanine and cytosine).
Y = Histone
Z = Pentose sugar
∙ When the chromosome is uncoiled, the first structure observed is known as chromatin fibre. It resembles a tightly coiled rope.
∙ Chromatinn fibre is made up of coiled ‘beads on a string’ like structure called nucleosomes.
∙ A nucleosome consists of DNA wrapped around an octameric protein known as histone. This kind of wrapping makes packaging of long DNA molecules efficient.
∙ DNA is a double stranded molecule that is made of two long chains of individual molecules known as nucleotides.
∙ The nucleotides are composed of three units, a phosphate group, deoxyribose sugar and one of the 4 nitrogenous bases (adenine, thymine, guanine and cytosine).
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