Cell Organelles Quiz

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What is the role of the fibrillar centre within the nucleolus?

Site of rRNAs synthesis (correct)

Site of RNA polymerase I activity

Site of ribosomal subunits assembly

Site of pre-rRNA processing

Where are the genes for 5.8S, 18S, and 28S rRNAs located in humans?

On chromosome 1

In the granular component of the nucleolus

In the nucleolus

On the short arm of acrocentric chromosomes (correct)

What happens to the nucleolus at the beginning of mitosis?

Increases in size

Transfers 5S rRNA outside the nucleus

Disassembles (correct)

It begins to reassemble

What is the function of nuclear speckles?

Function in pre-mRNA splicing Signup and view all the answers

Where are ribosomal proteins synthesized before they are transported to the nucleolus?

In the cytoplasm Signup and view all the answers

What is the primary role of Cajal bodies?

Modification of small nuclear RNAs Signup and view all the answers

How do nucleoli typically form after cell division?

By forming one large nucleolus after fusing together Signup and view all the answers

Where are 5S rRNA genes located and what RNA polymerase transcribes them?

On chromosome 1, transcribed by RNA polymerase III Signup and view all the answers

What happens in nuclear stress bodies during cellular stress?

Translocation to the nucleus and activation of gene expression Signup and view all the answers

What happens to nucleoli at the beginning of mitosis and telophase?

They disassemble at the beginning of mitosis and reassemble in telophase Signup and view all the answers

What is the main function of the nucleus in a cell?

Storage of genetic information Signup and view all the answers

Which organelle is the nucleus NOT directly connected to?

Lysosomes Signup and view all the answers

What happens to the nucleus during cell division?

It disassembles Signup and view all the answers

Which part of the nucleus contains the genetic material?

Nuclear Interior Signup and view all the answers

What is the function of the inner nuclear membrane?

Molecule exchange Signup and view all the answers

Which organelle shares a membrane structure with the outer nuclear membrane?

Endoplasmic Reticulum Signup and view all the answers

What is the nuclear envelope made up of?

Double lipid bilayer Signup and view all the answers

What is the function of nuclear pores?

Allowing the bidirectional movement of molecules between the cytoplasm and nucleus Signup and view all the answers

What is the role of nucleoporins within the nuclear pore complex?

Constituting multiple copies of proteins in the complex Signup and view all the answers

How do small water-soluble molecules pass through the nuclear pores?

Via specific aqueous channels in the pore complex passively Signup and view all the answers

What is the primary function of nuclear lamina?

Bind DNA with the nuclear envelope Signup and view all the answers

Which structure plays a vital role during prophase of mitotic division?

Nuclear lamins Signup and view all the answers

What is found in the nuclear interior of a cell?

Chromatin, RNA molecules, and proteins Signup and view all the answers

Which structure is involved in intense rRNA transcription and ribosomal subunit assembly?

Nucleolus Signup and view all the answers

'Nuclear bodies' within the nucleus are best described as areas that:

Contain different proteins and are involved in specific processes Signup and view all the answers

'Importins' and 'exportins' are primarily involved in:

Importing and exporting macromolecules into and out of the nucleus, respectively Signup and view all the answers

What is the function of central transport channels in nuclear pores?

Facilitating bidirectional movement of molecules with specific binding sites for substrates Signup and view all the answers