हिंदी

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

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प्रश्न

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

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उत्तर

In prokaryotes like E. coli, the DNA is not scattered throughout the cell despite the absence of a defined nucleus. Because DNA is negatively charged, it is held by certain positively charged proteins within a specific region called the ‘nucleoid’. In this nucleoid region, the DNA is organised into large loops that are stabilised by these proteins.
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अध्याय 5: Molecular Basis of Inheritance - HIGHER ORDER THINKING SKILLS QUESTIONS (HOTS) [पृष्ठ २७६]

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नूतन Biology [English] Class 12 ISC
अध्याय 5 Molecular Basis of Inheritance
HIGHER ORDER THINKING SKILLS QUESTIONS (HOTS) | Q 12. | पृष्ठ २७६

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संबंधित प्रश्न

In an octamer of the nucleosome, core DNA consists of ______ base pairs.


AUG codon gives ________ & ________ amino acids in prokaryotes & Eukaryotes respectively.


A typical nucleosome "bead" is made up of ______.


The chromatin is packed to form a solenoid structure of ______ diameter.


Nucleosome core is made of ______.


Barr body in mammals represents ______.


In the eukaryotic cell cycle, cell fusion experiments show that:


What is the function of histones in DNA packaging?


Which of the following amino acid residues will constitute the histone core?


The most abundant prokaryotes helpful to human in making curd from milk and in the production of antibiotics are the ones categorised as ______ .


Replication of DNA in eukaryotes is initiated by ______.


Part of chromatins which is densely packed stain darkly and is transcriptionally inactive is called ______.


Distinguish between heterochromatin and euchromatin with reference to staining property and activity.


The non-condensed, light stained and transcriptionally active segments of chromosomes are called ______.


Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.

Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome.

In the light of the above statements, choose the correct answer from the options given below:


What is a histone octamer?


Which of the following are core histones that form part of the histone octamer?


Which locations in the eukaryotic nucleus typically contain heterochromatin?


Describe the hierarchical levels of eukaryotic DNA packaging.


What is the charge characteristic of DNA packaging proteins in both prokaryotes and eukaryotes?


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