(A) The nuclear envelope consists of two parallel membranes with a space between them called the perinuclear space. This space acts as a barrier betwe

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(A) The nuclear envelope consists of two parallel membranes with a space between them called the perinuclear space. This space acts as a barrier between the materials present inside the nucleus and those of the cytoplasm. The width of this perinuclear space is typically $10$ to $55 \ nm$.

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

Medium

The width of the perinuclear space is $.............$.

A
$10$ to $55 \ nm$
B
$15$ to $50 \ nm$
C
$10$ to $55 \ \mu m$
D
$15$ to $50 \ \mu m$

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Class 11 Questions

Class 11

Biology Questions

Chapter

Cell: The Unit of Life

Subtopic

Nucleus and Chromosomes

Which chromosome possesses a structure known as a satellite?

Easy

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The diagrammatic representation of chromosomes is known as .........

Easy

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Some chromosomes have non-staining secondary constrictions at a constant location. What are these small fragments called?

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