Cell Nucleus Components
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Questions and Answers

The nucleus contains the molecular machinery to replicate the DNA and to synthesize and process all types of RNA during the process of apoptosis.

False

Chromatin is a type of RNA found in the nucleolus.

False

The nuclear envelope is a selectively permeable barrier between the nuclear and cytoplasmic compartments.

True

The nuclear lamina is a type of chromatin found in the nucleolus.

<p>False</p> Signup and view all the answers

Karyotyping is a process of studying the structure and function of the nuclear envelope.

<p>False</p> Signup and view all the answers

The nucleolus is a region of chromatin where DNA replication occurs.

<p>False</p> Signup and view all the answers

Karyotyping involves the analysis of only 23 chromosomes per human cell.

<p>False</p> Signup and view all the answers

During apoptosis, the nuclear envelope is broken down, releasing chromatin into the cytoplasm.

<p>True</p> Signup and view all the answers

Each nuclear pore complex regulates the movement of up to 1000 macromolecules per second between the nucleus and cytoplasm.

<p>False</p> Signup and view all the answers

The nucleolus is a region inside the nucleus where ribosomal subunits are synthesized.

<p>True</p> Signup and view all the answers

Chromatin is composed of only DNA and histone proteins.

<p>False</p> Signup and view all the answers

After DNA replication, each chromosome consists of four identical chromatin units called chromatids.

<p>False</p> Signup and view all the answers

In a cell's nucleus, the X chromosome is always transcriptionally active and visible.

<p>False</p> Signup and view all the answers

The nucleolus is primarily responsible for the synthesis of ribosomal proteins.

<p>False</p> Signup and view all the answers

The intense density of nucleoli is due to the presence of heterochromatin.

<p>False</p> Signup and view all the answers

The nuclear envelope is composed of euchromatin.

<p>False</p> Signup and view all the answers

The nucleolus is characterized by a diffuse, light-staining electron density.

<p>False</p> Signup and view all the answers

Heterochromatin is typically found at the periphery of the nucleus, associated with the nuclear lamina.

<p>True</p> Signup and view all the answers

What is the primary function of the nucleoporin complex in the nuclear envelope?

<p>To regulate the movement of macromolecules between nucleus and cytoplasm</p> Signup and view all the answers

What is the structural organization of chromatin in human cells?

<p>46 chromosomes, each consisting of two identical chromatin units</p> Signup and view all the answers

What is the role of the nuclear lamina in non-dividing cells?

<p>To bind to membrane proteins and associate with chromatin</p> Signup and view all the answers

What is the characteristic of the nuclear pore complexes in a growing cell?

<p>Each pore permits molecular transfer in both directions simultaneously</p> Signup and view all the answers

What is the primary component of chromatin?

<p>DNA and all the associated proteins involved in its organization and function</p> Signup and view all the answers

What is the function of the nuclear envelope in a cell?

<p>To act as a selectively permeable barrier between the nuclear and cytoplasmic compartments</p> Signup and view all the answers

What is the characteristic of chromatin in the nucleolus?

<p>It is a region where ribosomal subunits are synthesized</p> Signup and view all the answers

What is the function of cohesion proteins in chromatin?

<p>To hold together two identical chromatin units called chromatids</p> Signup and view all the answers

What is the description of the nuclear envelope in a cell?

<p>A double membrane structure with multiple pore complexes</p> Signup and view all the answers

What is the characteristic of the nuclear pore complexes in terms of symmetry?

<p>They display eightfold symmetry</p> Signup and view all the answers

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