(B) The image shows a 'beads-on-a-string' structure,which is characteristic of chromatin when viewed under an electron microscope. This structure repr

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(B) The image shows a 'beads-on-a-string' structure,which is characteristic of chromatin when viewed under an electron microscope. This structure represents the nucleosomes,which are the repeating units of chromatin,consisting of $DNA$ wrapped around a histone octamer. While the entire structure is chromatin,the specific repeating unit shown is the nucleosome.

Class 11 Biology Cell: The Unit of Life Nucleus and Chromosomes

Medium

Identify the structure shown below.

A
Chromatin
B
Nucleosome
C
Chromosome
D
Chromatin fiber

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Class 11 Questions

Class 11

Biology Questions

Chapter

Cell: The Unit of Life

Subtopic

Nucleus and Chromosomes

The nucleoplasm is continuous with the cytoplasm of a cell through

Medium

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How many layers are present in the nuclear envelope?

Easy

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$DNA$ is found in which of the following?

Easy

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In which type of chromosome is a satellite found?

Medium

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Match the following columns regarding chromosome types based on the position of the centromere:

Column-$I$ Column-$II$

$P$. Metacentric $I$. One arm shorter and one arm longer

$Q$. Sub-metacentric $II$. One arm extremely short and one arm extremely long

$R$. Acrocentric $III$. Terminal centromere

$S$. Telocentric $IV$. Middle centromere forming two equal arms

Column-$I$	Column-$II$
$P$. Metacentric	$I$. One arm shorter and one arm longer
$Q$. Sub-metacentric	$II$. One arm extremely short and one arm extremely long
$R$. Acrocentric	$III$. Terminal centromere
$S$. Telocentric	$IV$. Middle centromere forming two equal arms