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Molecular Basis of Inheritance question

2011 · Q67
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Molecular Basis of Inheritance question

2011 · Q67

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope ?
  1. A
    Nucleosomes
  2. B
    Genes
  3. C
    Nucleotides
  4. D
    Base pairs
View written solutionFree

Correct answer: A

The structures that appear as "beads-on-string" in the chromosomes when viewed under an electron microscope are nucleosomes.

Nucleosomes are the basic units of chromatin, which is the material that makes up chromosomes. Each nucleosome consists of a core of eight histone proteins, around which DNA is wrapped. The wrapped DNA and histone proteins together form a structure called a nucleosome, which appears as a "bead" on a string of DNA when viewed under an electron microscope. The string of DNA between the nucleosomes is referred to as linker DNA.

Nucleosomes play an important role in regulating gene expression and other cellular processes. The positioning and spacing of nucleosomes along the DNA can affect how accessible different regions of the DNA are to proteins and enzymes that carry out gene expression and other functions.

So, option A, "Nucleosomes," is the correct answer.

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