27 Questions
What is the role of the fibrillar centre within the nucleolus?
Site of rRNAs synthesis
Where are the genes for 5.8S, 18S, and 28S rRNAs located in humans?
On the short arm of acrocentric chromosomes
What happens to the nucleolus at the beginning of mitosis?
Disassembles
What is the function of nuclear speckles?
Function in pre-mRNA splicing
Where are ribosomal proteins synthesized before they are transported to the nucleolus?
In the cytoplasm
What is the primary role of Cajal bodies?
Modification of small nuclear RNAs
How do nucleoli typically form after cell division?
By forming one large nucleolus after fusing together
Where are 5S rRNA genes located and what RNA polymerase transcribes them?
On chromosome 1, transcribed by RNA polymerase III
What happens in nuclear stress bodies during cellular stress?
Translocation to the nucleus and activation of gene expression
What happens to nucleoli at the beginning of mitosis and telophase?
They disassemble at the beginning of mitosis and reassemble in telophase
What is the main function of the nucleus in a cell?
Storage of genetic information
Which organelle is the nucleus NOT directly connected to?
Lysosomes
What happens to the nucleus during cell division?
It disassembles
Which part of the nucleus contains the genetic material?
Nuclear Interior
What is the function of the inner nuclear membrane?
Molecule exchange
Which organelle shares a membrane structure with the outer nuclear membrane?
Endoplasmic Reticulum
What is the nuclear envelope made up of?
Double lipid bilayer
What is the function of nuclear pores?
Allowing the bidirectional movement of molecules between the cytoplasm and nucleus
What is the role of nucleoporins within the nuclear pore complex?
Constituting multiple copies of proteins in the complex
How do small water-soluble molecules pass through the nuclear pores?
Via specific aqueous channels in the pore complex passively
What is the primary function of nuclear lamina?
Bind DNA with the nuclear envelope
Which structure plays a vital role during prophase of mitotic division?
Nuclear lamins
What is found in the nuclear interior of a cell?
Chromatin, RNA molecules, and proteins
Which structure is involved in intense rRNA transcription and ribosomal subunit assembly?
Nucleolus
'Nuclear bodies' within the nucleus are best described as areas that:
Contain different proteins and are involved in specific processes
'Importins' and 'exportins' are primarily involved in:
Importing and exporting macromolecules into and out of the nucleus, respectively
What is the function of central transport channels in nuclear pores?
Facilitating bidirectional movement of molecules with specific binding sites for substrates
Test your knowledge on cell organelles such as the nucleus, endoplasmic reticulum, Golgi apparatus, lysosomes, and more. Identify organelles based on their functions and structures.
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